Oh damn right, he did! Gotta love that about Sam, though. I have a feeling he's known about him being her father all along because after all, he did stick around from the beginning. I mean he's known her since she was a child. Maybe Lily knew it too, just kept it a secret and Sam followed suit. Or... Lily asked him not to tell her.
It's interesting though because there are still quite a lot of things we didn't hear anything about. Like... where is/was Lily's husband, aka Nancy's father. Or.. where's Nancy? Does Catherine still have a sister at all? And how come she's not causing trouble, like everyone else in Cath's family? :lol: She's prolly boring so they left her out. And it's also interesting how we never found out how Catherine dealt with her mother after she found out about Sam being her father.