If they lie enough, they'll piss the judges off. Mine lied through her teeth, pulled a bunch of other stuff, scammed the government, welfare, etc...trust me, it all comes out in the wash if you fight hard enough.
With my ex, it cost her everything she owned (she fled the province on the heels of a Child Protection investigation)...also cost her the children...I have sole custody.
The trick with section 7 is to word it properly.
ie. The parties agree to split the costs associated to special expenses proportional to their line 150 notice of assessment amounts in each given year.
To facilitate this, as well as to facilitate proper calculation of child support, the parties agree to provide the other with a copy of their notice of assessment no later than June 30 of each year.
The parties agree that "section 7" expenses are hereby defined as any necessary, tax-deductable educational, medical or dental expense.**
The parties also agree that the amount of section 7 expense that will be split will be the net amount after any applicable deductions are applied. (ie. from benefits)*
The parties agree that any submitted section 7 expense that would exceed the maximum tax deductible amount for a calendar year will have to be agreed to at least 30 days prior and IN WRITING, or the other party will not be required to contribute towards the expense.
* This prevents her from nailing you with a bill for 4K when her/your benefits is picking up 2500 of it. Basically it means if the expense is 4000 and benefits cover 2500...the amount you pay on is 1500. (4000-2500).
** Do yourself a HUGE favor and define post secondary expenses separately...I don't care if the child is 18 months or 18 years. Do it NOW. This also means that you are limiting her to hitting you with stupid amounts of section 7...$500/year/child for sports activities, 3%?? of gross income for medical/dental amounts, etc. If it goes over this amount, she needs your agreement IN WRITING and 30 days before, or you don't have to pay.