Certified Mail Question

Invent a return address for the envelope. The only thing that will need your actual address is the back of the green return receipt card so it comes back to you and proves he received the contents.
He will not see the back of the card at all, only the mail carrier.

A lot of people refuse certified mail regardless of who sent it. It's a 50/50 chance.

The probate court will only care that she made the effort to pay him, and the signed card will be that proof.