What document should I sign with “sell by owner” transaction

[Sheery Ann Lariba]

What document should I sign with “sell by owner” transaction for the land purchase deal if the owner of the property is deceased , but he has a wife, she is alive. Property located in California . As I know in California is a community property State. But on the Deed there is only his name and written “as his sole and separate property”

Can his wife in this case sign an Affidavit and a Grant Deed?