If Mike marries Ana, Brandon, Jesus and Mariana will be adoptive siblings through Stef and Lena as well as step siblings through their biological parents marriage.

If AJ gets legally adopted by Mike, his name will be AJ Hensdale Foster. Which means, his girlfriend Callie Foster and him will have the same last name. They will also share Brandon Foster as a sibling. 

fosters character summaries
  • Stef: I'd know because I'm a cop.
  • Lena: I just think everybody needs to calm down.
  • Callie: *runs in front of a bus* *gets hit by a bus* Of course this would happen to me.
  • Brandon: Don't let anybody ruin your life. It's your life. So you should ruin it.
  • Jesus: I can't help it if everyone wants to have sex with me.
  • Mariana: You can be smart and sexy. I'd know. I'm both.
  • Jude: *on a school trip*