Ex-spouse may not compel you to keep anything in shared safe deposit box. You are entitled to retain passport if you have full legal custody.

You may open probate to resolve claims and inheritance rights. You will need attorney assistance.

Sister's estate responsible for her debts. Creditors may open probate and file creditor's claims against estate. You are not personally responsible.

You may include cemetary plot in your trust and provide distribution to your child.

Yes. Spouse may apply for your green card based on facts provided.

No. Your request will not be denied. Legal name changes are liberally granted. Link explains: https://selfhelp.courts.ca.gov/name-change

No. Treble damages not likely. You may request added costs of enforcement and collection.

Collecting judgment often more difficult than obtaining judgment. Link explains: https://selfhelp.courts.ca.gov/small-claims/after-trial/if-you-win

Spousal property petition required. A Spousal Property petition is a way to transfer or confirm property to a surviving spouse without a full...

You are entitled to copy of trust and all amendments. Hire probate counsel to make the demand for you. After review of documents, your attorney...