Andi's world turns upside down when her older sister, Bex, returns home on her 13th birthday and reveals a family secret.

Andi decides to keep the news about Bex from her friends.

Andi gets in trouble for the first time at school.

Bex throws Andi a house party!

Andi's upset when Buffy and Bex spend time together.

Andi tells Jonah about seeing Amber with another guy.

Bex and Cyrus have news for Andi.

Andi must adjust to Bowie being in her life full time.

Jonah asks Andi to help him pick out a gift for Amber.

Andi and Bex adjust to their new living arrangement.

Bex helps Andi stand up against the new dress code.

Amber fails to defend Jonah when her friends mock him.