It's Cerelli, but you're right, he really isn't familiar enough. Besides, that's the first thought that would pop into Billy's head, Who the fuck-Cerelli.

Sean has CONTROL issues.

Sophie's such a bossy-boots, but then she's a beloved only child. Honestly, with her things, I think she likes having BIlly around, because there's someone for her to say, "Be careful" to.