Edward was William's great Uncle No, Edward was William's father's cousin, not his uncle. William's grandfather (Richard II) was brother to Edward's mother (Emma). Therefore, Richard's son (Robert I,...
Edward's mother was the sister of William's paternal grandfather. http://en.wikipedia.org/wiki/Emma_of_Normandy#Family_tree (See her family tree).
They were distant cousins.
Probrably not because Edward Cullen is a fictional character (unless you share the same name) Good Book seiries though.
Yes. He is her grandfather.