Help with dependency?

Hi friends- I’m trying to figure this out but I’m getting conflicted info.

I met a girl, we’ll call her Sarah.

Sarah had a son Jack.

Sarah and I split up 9 years ago, but Jack stayed with me. (We were never married)

My mom (who is of no blood relation to Jack) has been claiming him as a dependent for IRS taxes for years, because although I provide financials, she provides housing.

Jack is going to college in 2 years.

When Jack fills out his FAFSA, will my mom’s income be counted toward family contribution? Or only Sarah because she is the only parent?

Thanks!