I’ve had brothers, sisters try to sign for the actual signer. A son for his father. A married woman try to sign as her single self. I’ve also never had a signer who couldn’t come up with a ‘preponderance of evidence’ ( a wallet or purse full of ‘info’…which, while not a ‘proper’ ID, did have the ‘missing’ info…usually multiple times). Ask a relative? Oh, sure, Mom said son was husband and they had the same name…except for the middle initial. It 's always someone in the family. Still, what’s most important is ‘what are your state laws’ on this.