TaxGuyBill
Level 15
Make sure Mother agrees to let Father claim 100%.

By default (no agreement), the mother would claim 33%.

However, if there was Advance credit (column C of the 1095-A) that would mean she would need to PAY part of it back.  If there was not any Advance credit, she could want to be spiteful and take the 33% just to not let Father have it, and there would be nothing the father could do about it (other than going to Family Court).