Sure. Hire a private investigator and get a report.

It depends on the terms of the trust. It would be usual for you to be reimbursed. But, the document must provide for it.

This will be complicated and expensive to unravel. It depends on the POA and if it was done correctly. Then, it will turn on if your father...

To protect yourself you can petition the court for a declaration the guy cannot be found. But, I am not sure you have done everything you can do. ...

Your birth certificate, DNA test (which I recommend doing), and anything where he acknowledged you as the child, like cards, etc.

Was there a trust ever set up? Who was the trustee?

Your question has an inherent inconsistency which shows more investigation is needed. A stock account with a beneficiary passes to the...

You can file bankruptcy with a POA, but it is not going to solve the problem you wish to solve.

There is a proceeding to open a safe deposit box, if there is not another pending estate proceeding.

You can do it. What kind of proceeding depends upon the size of the account.