The funeral claim is a valid claim and it should be repaid from assets of the decedent before distributed to heirs. The son has no personal...

This document has no legal effect. You need your aunt to do a will or give you the property now.

You can sue, but you have an uphill climb unless you have some writing that acknowledges the debt. But, if you do not sue you get zero, so it...

She is not right. It is her home. She can pay the mortgage or not. If not, she will be foreclosed. Not your issue.

Yes, based on your post the title is a mess. Likely you need to probate her will and get your siblings to deed their shares to you.

Put it in an Irrevocable Trust. That is the best way.

Calling the Adult Protective Service will likely do nothing. The issue is how impaired is your father. If slight, he can do what he wants,...

Yes, if jurisdiction is not complete within 120 days, and time to serve has not been extended, the action should be dismissed.

DNA testing. If no one related to your father will cooperate, then you can get a court order for it in the Surrogates Court.

Next of kin must get notice so sounds like yes.