Guardianship is a legal status. OP has said she is their legal guardian (but I agree this may be confused, since they’re over 18.) She has not said responsibility for the children was terminated for cause. As I see it, OP retains the full definition of “parent” - unless some info is missing, some court action or some such.
If grandma wants to claim an exemption for them on her own taxes, as supporting them, that’s a different issue than how finaid defines parent.
What did she ask the Fafsa folks? Think something is confused.
- Lots of kids live elsewhere during college and/or summers, some with family. So what's missing here?