Foster

I have a foster daughter that was placed with us in March/April of 2024 from DCS. We still have her. Do I do anything on taxes? Is she considered a dependent or anything? Also I don’t know her ss#. 

I also have a question about my 20 yr old son who is now not in school but made 5400. I know I don’t claim him as dependent and he doesn’t have to file federal taxes. Is he required to do state? We live in Indiana