Originally posted by: goth princess
they dont tell harrys grandparents name in any of the books. (sorry if im wrong)
You are not wrong.
Check this out for the HP--Lexicon which has pretty accurate info always.
http://www.hp-lexicon.org/wizards/potter.html
[quote]
Harry Potter's Family
According to Dumbledore, the Dursleys are Harry Potter's only living relatives (PS1). We do know a little about the rest of the clan, but not much. Here's the family tree so far:
Potter family:
Very little information is given about this side of the family. Harry sees a grandfather among the various relations in the Mirror of Erised, but we aren't given any more than that. It would seem that all the Potter family were Wizards, and that they're all dead (PS12). JK has told us that there was nothing sinister about the deaths of Harry's Potter grandparents (TLC).
Sirius Black ran away from home at the age of 16 and moved in with James' family. He said that James' parents took him in as "a second son" (OP6), which strongly suggests that James was their only son.
Evans family:
Lily Evans has a sister named Petunia Evans. Lily is a Muggle-born witch. Petunia grew up resenting her sister and the way their parents seemed to approve of Lily's magical ability. Petunia is married to Vernon Dursley.
Dursley family:
Vernon Dursley is completely Muggle. He has no use for anything having to do with magic, thank you very much. As far as we're told, his family consists of himself, his wife Petunia, their spoiled son Dudley, and his sister, Marjorie (Aunt Marge).
[/quote]