Family law is a disclosure business before it is anything else. AI is good at organising disclosure and building the chronology, and has no business anywhere near the outcome.
Key takeaways
Canadian family law firms use AI on the paper: sorting and labelling financial disclosure, building the income picture from what the other side produced, assembling chronologies from years of correspondence, and drafting first versions of routine letters. It is not used to determine support, to assess parenting arrangements, or to decide what the client should accept.
That is not a cautious framing, it is where the leverage is. On most files the largest non-billable drag is unstructured disclosure arriving as photographs of bank statements and a partial set of tax documents, and someone junior spending days making it usable.
The requirement is specific, which is what makes it automatable. Section 21 of the Federal Child Support Guidelines requires an applicant whose income information is necessary to include, with the application, personal income tax returns for each of the three most recent taxation years and every notice of assessment and reassessment for those years. An employee must provide the most recent statement of earnings showing total earnings paid in the year to date, or an employer letter giving that information and the rate of annual salary. A self-employed spouse must provide the financial statements of the business or practice for the three most recent taxation years plus a breakdown of salaries, wages, management fees and other payments to persons or corporations with whom the spouse does not deal at arm’s length. Partners, those controlling a corporation and trust beneficiaries each have their own listed obligations.
Section 21 also sets timing for a respondent: within 30 days after service if they reside in Canada or the United States, and within 60 days if elsewhere, or as the court specifies. A checklist that mechanical is exactly the sort of thing a tool can verify a file against.
In Ontario the financial statement itself is a prescribed court form — Form 13 for support claims and Form 13.1 where property is also in issue, with Form 13B a net family property statement and Form 13C a comparison of them. The current forms are published on Ontario Court Services’ family law rules forms page. Treadstone Law explains what Form 13.1 requires, and more broadly financial disclosure obligations in Ontario family court and what has to be shared on separation. Failure has consequences: costs can be ordered as a sanction.
Sorting and labelling disclosure. Identifying which document is which, which tax year it belongs to, which are duplicates and which are illegible, then naming and filing them consistently. Days of paralegal time, done in an hour and checked in another.
Building the completeness list. Comparing what has arrived against the section 21 list and the prescribed form, and producing the request for what is missing. This is the highest-value use in the practice, because the follow-up letter is what actually moves the file.
The income picture. Pulling line items from returns and notices of assessment into a table across three years, with the source document noted against each figure so it can be checked. Extraction, not computation.
Chronologies. Building a dated timeline from correspondence and messages, which is the backbone of most affidavits and settlement briefs.
First drafts of routine correspondence. The document request, the acknowledgment, the scheduling letter — reviewed and sent by a lawyer.
The determination of income for support purposes, the treatment of a corporation’s retained earnings, whether a payment is a genuine business expense, whether undue hardship is made out, and every parenting question. Under the Divorce Act a court must take into account only the best interests of the child in making a parenting order, which is a judicial determination on the evidence of that family. Nothing about that analysis is a pattern-matching exercise, and a tool that offers a view on it is offering something it cannot have. The Department of Justice’s family law resources are the starting point for the federal framework.
The line in a family file
A family file contains financial records, health information, allegations, and information about children. Rule 3.3-1 of the Model Code of Professional Conduct requires strict confidence over all of it, and in Ontario the Rules of Professional Conduct govern. PIPEDA’s fair information principles apply to the personal information, and the Office of the Privacy Commissioner’s generative AI principles single out the need for particular care where children and vulnerable groups are affected, alongside establishing that a tool is necessary and proportionate for the purpose.
In practice that means: no client material in a consumer chatbot, a written record of which tools are approved for which material, and a firm position on whether prompt content is used for further training. The Law Society of Ontario’s practice supports are the place to look for Ontario practice-management guidance.
A new client arrives mid-dispute with a banker’s box and a phone full of photographs. The other side has produced three years of returns but no notices of assessment, a partial set of statements, and nothing at all for a corporation the client believes their spouse controls.
The first pass classifies and names every document, groups them by year and account, and flags the unreadable ones for rescanning. The second pass compares what exists against the section 21 list and the Form 13.1 requirements, and produces a gap list: missing notices of assessment for two years, no corporate financial statements, no non-arm’s-length payments breakdown. The lawyer reviews the gap list, adds what the tool could not know — that a trust may exist — and the request letter goes out on day two rather than week three.
No conclusion about income has been drawn at any point. The file simply arrives at the analysis stage weeks earlier, with the disclosure organised well enough that the lawyer can actually think about it.
Can AI calculate child support?
The table amount follows from a determined income and number of children, and calculators have existed for years. The determination of income is the legal work, and section 21 exists because that determination rests on specific documents.
Can we use it to summarise the other side’s affidavit?
For your own reading, with the summary checked against the affidavit before anything is relied on. Never quote from a summary.
Do we tell the client?
Your regulator, your retainer and your judgment govern. Many firms now address technology use in the retainer letter, which is a cleaner place to have the conversation than mid-file.
A 30-minute call is enough to tell you whether AI pays for itself here.
