To everybody who has been asking where Alex's father is, and how Enza and Kim are related...
Alex's father has never been brought up on the show, but he has come up in the webcam interviews on this site.
Alex's father (who is Enza's brother - that is definitely how they're related) is not in the picture. According to Enza's latest interview, he left Kim at some point (apparently because of Jeannette. Because the silent, reclusive grandmother is suddenly to blame for everything). According to Kim's interview in week 1, he hasn't been in the picture for some time, although his sister Enza and his mother have been.
It is unclear why he isn't in the picture, just that he definitely isn't. The way Kim and Enza talk about him kindasorta implies that he's still alive. The impression that I got from hearing the interviews is that he's a deadbeat dad.