Neither of Harry's grandfather's were ever officially given a name in the books.
His paternal grandfather is briefly mentioned in Sorcerer's/Philosopher's Stone when Harry sees him in the Mirror of Erised, and we know from Deathly Hallow's that he was in Gryffindor like both James and Harry, but beyond that, we don't really know anything else about him. There is really nothing at all significant that we know about his maternal grandfather either.
'Gramps' is an American word for grandfather, but Dumbledore doesn't have any (grand)children.
The actor who played harry was called Daniel Radcliffe.
If you mean "owl", that would be Hedwig.
The Avada kedavra curse left harry potter with the scar on his head
Harry Potter was a wizard
The feather of a phoenix called Fawkes (Dumbledore's phoenix).
Ron Weasley's sister is called Ginny Weasley.
The Professor's name is Madam Hooch
There is no such person.
No
not in the film, no
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