Stan Goodman wrote on 19 dec 2004 in soc.genealogy.jewish:
Actually, the form asks "What is your relationship to the deceased",Yes, to a genealogist.
No, to a normal human being.
Two answers possible for the latter with the same relationship:
[I am his] grandson
[He is my] granddad
(Please change the x'es to dots in my emailaddress)