To the extent that it was an accident or error, it is not fraud. Fraud requires the intent to deceive. See an attorney knowledgeable in Medicaid law.

Probably not an issue. See an attorney……………………………. .

Eventually, fathers half will need to be addressed. If you do not need to do anything with the house, there is no hurry.

"Can you legally?" is an interaction between the trust document and applicable law. See an attorney with the trust document.

The trust should cover what happens to a decedent's share. Read the trust. Bring the trust to an attorney for interpretation.

Probably. Also, there should be other evidence of the trust such as a recorded deed transferring real estate to this trust. Perhaps other...

Probably. See an attorney. .....................................................................................

Probably. Talk with an attorney. Perhaps an order granting relatives ownership of possession through an abbreviated probate process would be good...

Why? What purpose can owning 1/3 of a vehicle have? ...........................................................

Depends on the POA. See an attorney.........................................................................