@rosborne979,
The hints I picked up on from episode 6:
Gran is dead. Bill tells Sam this is not the time or place to "mark your territory." Also, Bill says he has been around a while and Sam says he knows her pretty well himself, suggesting he has been too.
Sam, in talking about his family says they aren't close, he was pretty much on his own.. ah crap... and something else I can't temember now that made it sound more like he was kept than reared. I think it was a reference to his "parents" as his owners / handlers or something similar which would be a dogs perspective.
We haven't heard how Sookie and Jasons parents died, have we? The conversation in Episode 6 with Sam suggesting he knows a lot about Sookie made me wonder if he went back that far in Sookies life....