No. It is not the mortuary's obligation to verify next of kin. You may be able to sue his mother for fraud.

A review of title is required in order to answer your questions. Reach out to an attorney.

If the entire trust was changed, that is improper. If only the survivor's portion was changed, that is fine. See an attorney.

Look at your contract. It will tell you where you can sue. If NJ, see if you can sue in small claims court and appear virtually, which is more...

A Quitclaim deed will do nothing. Depending on the value of his share some probate procedure, whether it be a small estate transfer or full...

Yes, sign a Declination to Act and give it to the next person named in the will as executor along with the will if you have it.

Probate of "Auntie's" estate will be required. Legally her adopted daughter is an heir. Someone will have to apply for guardianship of the child....

John Doe and Jane Doe, Trustees of the John and Jane Doe Trust (complete name of trust).

Prepare an order consistent with the Minute Order, give a copy to the other side and submit it to the court for signing.

Yes, as stated this does expose your personal assets in the event of a lawsuit.