Apart from PLL, I have never seen a show I liked more than this. The main premise is the family thing (having the adopted kids and the foster kids) but the individual plots are not just about that. The plot line that I enjoy the most is the one where Mariana is meeting her birth mom, but it's very interesting to see Callie deal with liking Brandon when she's not allowed to be with him.
There is so much good stuff in this show, that I love. I love the awareness this is giving to the foster care system, and I love that it's doing a great job of just openly addressing the controversial issue of gay relationship (and showing that they're right). My favourite character is Mariana, because she's just very interesting and I like how realistic she is (teenage girls are like that. I don't like how everyone says Mariana is mean or b***y or something when that's just how 15-year-old girls ARE). Cierra Ramirez is a fabulous actress, too. Callie is an amazing character, too, she's so kind and has definitely been developed the most from episode 1. There is not a single character on this show I don't like, except maybe Stef. All of the actors are great. Overall, this is an amazing show! It does address drinking, teen sex, and have several violent scenes, but they all have good messages about the issues. It is a definite TV-14, though, unlike even PLL which can be PG a lot of times. I'd say depending on the maturity, any kid 11 and up could watch it (my 10-year-old loves it, but sometimes I have to turn it off for some parts), but certainly not every 11-year-old (or even every 12/13-year-old).