In answer to your first question, use your signature.
If no personal representative has been appointed and if there is no surviving spouse, the person in charge of the decedent's property must file and sign the return as “personal representative.”"
See HERE under Subcaption "Signature on pg, 5".
Also see HERE
In answer to your second question, use your mother's drivers license.
[Edited 02/05/2024|2:37 pm PST]
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