The parent who claims her as a dependent is the one to claim the AOTC.
Kingx16 there is nothing wrong or bad about your dad giving the Educational credit $$ back to your sister. I use mine every year to pay off my daughters unsubsidized loan, that’s just smart!
No, @twoinanddone is right, the parent who claims the child can claim the education credit. I was just wondering since you mentioned your mom owing on her tax return, the credit might have helped with that.
Are your parents divorced and filing head of household? I thought if you filed married separately you could not claim an education credit.