After you file

Yep ... I call that the scavenger hunt notice so do the best you can. The IRS has the right to question anything on any return at anytime.  Respond as if this was a "word question" on a final exam ... give short consise answers and refer the attached documents for instance 1) see attached SS cards (remember only send copies ... never originals as they will not be returned).

If you filed a joint return then the entire support situation is immaterial if this was your child who lived with you ... do your best.

Even home schooling has some kind of records as you have to follow some kind of curriculum and testing schedule.  

Read those forms carefully ... watch for the little words ...  note  that some proof is on all the  lists ... you so not need to send them multiple times.