Well fuck. That's too good of a guess to be a coincidence. -- He stares at the other man, trying to come to some sort of conclusion about him.

"My sister." No reason to hide that fact, when she'd probably offer it up to anyone who asked and he's made no secret of having family.

"There's four more of us, scattered around someplace." And it's his primary purpose to find them, but he tries to sound casual when he brings it up. The implication is clear enough.