Summary
Case Summary: In re Marriage of Siddiqui, 2025 IL App (3d) 220355-U - A single undocumented overnight count or a $350 discrepancy in insurance costs can transform a straightforward Illinois child support case into a $100,000 appellate disaster, as the Third District's reversal in In re Marriage of Siddiqui starkly demonstrates. From inaccurate parenting time records and inconsistent financial affidavits to deleted text messages and social media missteps, these seven preventable mistakes cost parents custody, credibility, and tens of thousands in legal fees—making meticulous documentation and strategic restraint essential survival tools in family court.
Introduction: In 15 years practicing family law in Illinois, I've seen these seven mistakes cost clients custody, money, and leverage. The Third District's recent decision in In re Marriage of Siddiqui shows exactly what happens when litigants treat critical facts as afterthoughts. They don't just lose their case—they pay for expensive appeals. Don't be next.
Mistake #1: Failing to Document Overnight Counts Accurately
What It Looks Like: Parents estimate their parenting time from memory. They guess at overnight numbers. They present rough calculations instead of precise records.
Why People Make It: Most parents assume the court will trust their word. They don't realize Illinois's shared-care formula requires exact overnight counts. Every night matters mathematically.
Real Consequence: In Siddiqui, the appellate court reversed the child support determination. Why? The trial court accepted 161 annual overnights without proper evidentiary support. Both parties faced months of additional litigation.
The Cost: $15,000-$40,000 in appeal fees. Six to twelve months of extended proceedings. Complete recalculation of support obligations.
How to Avoid It:
- Use parenting apps that create timestamped exchange records
- Maintain a detailed custody log with specific dates
- Back up calendar entries with corroborating evidence
Illinois Law: 750 ILCS 5/505(a)(3.8) governs the shared-care formula. Overnight counts directly impact calculations.
Mistake #2: Submitting Inconsistent Financial Affidavits
What It Looks Like: A parent lists $400 monthly for health insurance on their financial affidavit. Then they claim $750 monthly at trial. The numbers don't match.
Why People Make It: People rush through financial disclosures. They don't cross-reference their own documents. They treat affidavits as rough estimates.
Real Consequence: In Siddiqui, conflicting evidence about insurance costs contributed to the reversal. The court found $750 per month against the manifest weight of evidence.
The Cost: Case reversal. Credibility destruction. $10,000-$25,000 in additional attorney fees to fix the damage.
How to Avoid It:
- Produce actual premium statements—never estimates
- Review your financial affidavit against all supporting documents
- Update affidavits immediately when costs change
Illinois Law: Financial affidavits are sworn statements. Inconsistencies can constitute perjury under Illinois law.
Mistake #3: Posting About Your Case on Social Media
What It Looks Like: A parent vents on Facebook about their ex. They post vacation photos during claimed financial hardship. They discuss case details in group chats.
Why People Make It: They don't realize social media is discoverable evidence. They forget that "private" posts can be subpoenaed. They need emotional support and turn to the wrong outlet.
Real Consequence: Client's Facebook posts about "partying every weekend" proved she wasn't a fit parent. Screenshots of expensive purchases undermined claims of inability to pay support.
The Cost: Lost primary custody. Reduced to supervised visitation. Imputed income based on lifestyle evidence.
How to Avoid It:
- Lock down all social media accounts immediately
- Don't post about your case, opposing party, or children
- Assume everything you write electronically will be read in court
- Use encrypted communication for attorney correspondence
Illinois Law: Illinois Supreme Court Rule 201 allows broad discovery of relevant evidence. Social media posts qualify.
Mistake #4: Hiding Income or Assets
What It Looks Like: A parent underreports cash income. They transfer assets to family members. They "forget" to disclose cryptocurrency holdings or side businesses.
Why People Make It: They believe hidden income won't be found. They think informal income doesn't count. They underestimate forensic accounting capabilities.
Real Consequence: Courts impute income based on lifestyle. Hidden assets get discovered through subpoenas. Judges impose sanctions and award attorney fees to the other side.
The Cost: $5,000-$15,000 in forensic accountant fees charged to the hiding party. Fee-shifting under 750 ILCS 5/508. Potential contempt findings.
How to Avoid It:
- Disclose all income sources completely
- Provide three years of tax returns without redactions
- Document all asset transfers with legitimate explanations
Illinois Law: 750 ILCS 5/501(a)(4) requires full financial disclosure. Violations carry serious consequences.
Mistake #5: Missing Filing Deadlines
What It Looks Like: A parent files their response one day late. They miss the discovery deadline. They fail to appear for a scheduled hearing.
Why People Make It: They don't calendar dates properly. They assume extensions are automatic. They underestimate how strictly courts enforce deadlines.
Real Consequence: Motions get dismissed. Default judgments get entered. Critical evidence becomes inadmissible.
The Cost: Case dismissal. Waived rights. $2,000-$5,000 in attorney fees to file motions to reconsider—with no guarantee of success.
How to Avoid It:
- Calendar every deadline immediately upon receipt
- Set reminders one week and three days before due dates
- File early—never on the deadline date
Illinois Law: Illinois Supreme Court Rules 181-183 govern discovery deadlines. Courts enforce them strictly.
Mistake #6: Deleting Text Messages and Digital Evidence
What It Looks Like: A parent deletes angry texts they sent. They clear their browser history. They "clean up" their phone before discovery.
Why People Make It: They're embarrassed by what they wrote. They think deleted means gone forever. They don't understand spoliation consequences.
Real Consequence: Forensic recovery reveals deleted content. Courts draw adverse inferences. Sanctions get imposed for evidence destruction.
The Cost: $2,000-$10,000 in digital forensics fees. Adverse inference instructions to the judge. Credibility destruction.
How to Avoid It:
- Preserve all communications once litigation begins
- Screenshot important exchanges immediately
- Use cloud backup to maintain complete records
Illinois Law: Spoliation of evidence can result in sanctions under Illinois Supreme Court Rule 219(c).
Mistake #7: Fighting Over Every Minor Issue
What It Looks Like: A parent litigates vacation day interpretations. They file motions over minor scheduling changes. They refuse reasonable settlement offers out of spite.
Why People Make It: Emotions drive decisions. They want to "win" on principle. They don't calculate the cost-benefit of each battle.
Real Consequence: In Siddiqui, the mother was ordered to pay the father's attorney fees for parenting time abuse. Fighting everything backfired completely.
The Cost: Trial costs 3-5x more than settlement. Fee-shifting punishes unreasonable conduct. $40,000-$100,000+ in high-conflict cases.
How to Avoid It:
- Calculate the actual cost of each dispute before engaging
- Draft vacation provisions with surgical precision upfront
- Consider mediation at $200-$500 per hour versus trial costs
Illinois Law: 750 ILCS 5/508 allows courts to award attorney fees when one party's conduct forces unnecessary litigation.
The Underlying Pattern
These mistakes share common roots:
- Lack of preparation: Not organizing documents and evidence ahead of time
- Emotional decision-making: Letting anger drive strategy instead of logic
- Ignoring professional advice: "Googling" instead of consulting an attorney
- Underestimating consequences: Thinking "it won't matter" when it absolutely will
The Siddiqui case is a warning shot. The Third District reversed on child support because the evidence didn't support the numbers. That's an avoidable failure. It cost both parties tens of thousands in additional legal fees.
Your Mistake-Prevention Checklist
- ☐ Consult an attorney BEFORE filing—not after you've made mistakes
- ☐ Document everything and keep evidence organized chronologically
- ☐ Follow court orders precisely—even if you disagree
- ☐ Meet every deadline and calendar all due dates
- ☐ Preserve digital evidence—don't delete anything
- ☐ Protect your digital privacy with encryption and secure communication
- ☐ Stay off social media or make accounts private
- ☐ Be honest on financial affidavits—perjury has serious consequences
- ☐ Focus on what matters and pick your battles strategically
- ☐ Consider settlement seriously—trial is expensive and unpredictable
What to Do If You've Already Made a Mistake
If you recognize yourself in these mistakes, take action now:
- Stop immediately: Don't compound the error with more bad decisions
- Disclose to your attorney: Lawyers can often mitigate damage if informed early
- Document the correction: Create a paper trail showing you fixed the problem
- File corrective pleadings if needed: Amended financial affidavits and motions to reconsider exist for a reason
- Don't hide it: Courts forgive disclosed mistakes more readily than discovered deception
Proper documentation and strategic budgeting make the difference. A $10,000 child support case can become a $100,000 appellate nightmare. Your opposition may rely on demonstrative calendars without backup. They may cite insurance costs that don't match their own affidavits. Be better prepared.
If you're worried you've made a mistake in your child support case, consult an Illinois family law
Full Opinion (PDF): Download the full opinion Yes. Social media posts are admissible as statements of a party-opponent under Illinois evidence rules. Posts, photos, check-ins, and messages can be used to challenge credibility, demonstrate lifestyle inconsistent with claimed finances, or question parenting fitness. Even 'private' posts can be obtained through discovery. No. Deleting accounts or posts after litigation begins can constitute spoliation of evidence, resulting in sanctions, adverse inferences, or evidentiary presumptions against you. Instead: stop posting, set accounts to maximum privacy, and avoid discussing the divorce or your spouse online. No. Accessing accounts without permission violates federal law (Computer Fraud and Abuse Act) and Illinois law (720 ILCS 5/16-16.1). Evidence obtained illegally is inadmissible and can result in criminal charges. Use formal discovery channels through your attorney to obtain social media evidence legally. Written by Jonathan D. Steele Chicago divorce attorney with cybersecurity certifications (Security+, ISC2 CC, Google Cybersecurity Professional Certificate). Illinois Super Lawyers Rising Star 2016-2025. For more insights, read our Divorce Decoded blog.Frequently Asked Questions
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