How do I get my nephew's inheritance to him while he is incarcerated in a California prison?

Your attorney can assist with this but basically, if he has any restitution, that will be paid out of his share. From there, all you have to do is...

I need a legal advice

Have someone take you to the dealership and demand your driver's license or tell them you will call the police. Your situation is very, very odd...

Your attorney is likely entitled to his fee based on your facts. It sounds like you will not be hiring another attorney. If you did, in that case...

What can I do?

Power of attorney expires on death. The trust would then control. If there is a legal separation or divorce, that might change.

Mother of bological child dies, father non biological controls estate. Is daughter still entitled to inheritance.

Why is the daughter's name different? If it is a mistake, a maiden name, etc. such that it does not change the fact that the money was intended...

If a lien for child support was not addressed at the probate of the deceased estate is it still active?

You can expunge the lien if you are the payee. If the county is the payee, it remains and will have to be paid.

Can changes be made to an irrevocable trust without petitioning the court, and without consent of all beneficiaries?

Possibly. An attorney would have to review the trust and the change, the timing of the change, etc. to determine the strength of your case.

You are living with a man you intend to married for four years he dies the week before he is going to put her on the deed

No. Gift or transfer must have been in writing and been complete.

It is the son's unless and until he is found to be deceased. Then it would go to next of kin.

I am the trustee of now an irrevocable trust because my dad died? No one is going to contest it. Do I have to wait the 120days ?

Yes unless you get waivers from the beneficiaries of the 120 notice period.