Interestingly enough, I am in the exact opposite situation. I am a full-time custodial father of my two children in Ottawa, Ex-spouse is in NB. She owes her father about $20,000.00 in personal unsecured family debt. She tried to play this issue to support her being poor 'card' to reduce child support. At the very best, the most she will be able to prove is a debt that may or may not help with her undue hardship claim.
My argument that she used the $20,000.00 to boost her home's value through renovations went on deaf ears, although she was given a 60 day adjournment to prepare a case for undue hardship!
The point is, family money is, and always has been a contentious issue before, during and, obviously, after marriage.