This number is an IRS scammer.  Please do not give him any information.  Calmy tell him you will check with your tax atorney.   Then block the number from your phones and all your loved ones espically the elder.  Than dail *67 and the number repeatedly until the jerks takes the phone out of service.  You can't get in trouble for doing this as you are not impersonating anyone.  You'll walk away with a good feeling in your sole....revenge!!!!!!!