My client tragically passed 2-25-24 with no will and very few assets. He is due a federal refund and since there is no executor for his estate his sister will collect the refund using form 1310. My question is can  I e-file his return along with 1310 as part of it with no signature in part lll, or do I print it, have his sister sign the form and attach it as a PDF.

The sisters name and S.S # are listed in the heading.

Part 1 box C is checked

Part ll boxes 1,2a & b are marked NO and box 3 is YES.

 As always thank you an advance for your help.