Doodle's birthday invitees

Doodle asked me to make a list of all the people he is planning to invite to his birthday party, which isn't until April.    He rattled off a bunch of friends then said:
Grandma, Grammy, Grandad . . .  and my great-great-grandfather.
Me: Who is your great-great-grandfather?
Doodle: Otahn!  (Otahn is my father)
Me: Othan is your grandfather, not your great-great-grandfather.
Doodle: Who is my great-great-grandfather? 
Me: He isn't living any more.  You never met him, I never met him either.
Doodle: I want to invite Uncle Dick, is he still living?  (Uncle Dick is my uncle)
Me: Yes, he's still living.

The list also includes Daniel, but not Dori.