Jack has... yeah, actually, Jack has no idea about Ianto's family. Not having had a family of his own for so long, it's not something he really thinks about.
He chuckles, and relaxes against his lover while he reviews the other people he kissed this evening. An odd situation for some, perhaps, but to Jack it's just being him.
"Well, there was this cute girl called Raven, very sweet, and surprisingly outgoing once she got - uh - going! And Rose - vampire Rose not Rose Tyler - I caught her off guard and got quite a smacker out of her! Best, though, was Fingers - uh, Penelope, Penelope Garcia, have you met her?" He thinks he remembers seeing Ianto talking to her at some point but the whole thing's becoming a bit of a blur by now.