Most legal fees incurred in family law situations are not deductible for Canadian income tax purposes. The main exception is for fees incurred to enforce a support or maintenance order or to obtain child support.
"This article provides information of a general nature only. It is only current at the posting date. It is not updated and it may no longer be current. It does not provide legal advice nor can it or should it be relied upon. All tax situations are specific to their facts and will differ from the situations in the articles. If you have specific legal questions you should consult a lawyer."