The serie is about The Fosters family that is consisting of a lesbian Stef and Lina couple have a family of adopted kids (teenagers) one of them is Brandon, son of Stef and the other two guys, Jesus and Mariana two Mexican twins.
Everything was doing okay in their house until Callie and Jude (Callie's half-brother.) appear in their lifes, Brandon and Callie fell in love but they can't be together, Callie wants a better life for her and brother and that means that she want to be adopted by Lina and Stef.
Jude get adopted but Callie doesn't, because her biological dad don't want no one to adopt her... you think that means that Callie and Brando can be together? Well no, Brandon is dating someone else now, even that he say he still in love with Callie.
Stef and Lina try the best to making her feel like part of the family... Even though they can't adopt her yet, I'm not telling you more stuffs about this show because you really need to watch it.