As the family deals with the aftermath of the terrible car accident, Stef is determined to find the driver responsible for the crash. Callie continues to volunteer at the drop-in center where she meets AJ, a foster teen runaway searching for his older brother. Brandon starts at the Idyllwild Music Program and quickly realizes that he will be faced with serious competition. Meanwhile, Jude tells Connor he prefers to keep their relationship private at school.
As part of their annual tradition, Stef and Lena have Mike over for Father's Day brunch. Jude surprises everyone, especially Callie, by inviting his biological father, Donald, to join them. Callie spends Father's Day with the Quinns and hears some surprising news. Frustrated by his situation at Idyllwild, Brandon let's off some steam with his classmates.
When the family takes a vested interest in AJ, Callie has doubts about whether she can trust him. Stef surprises Lena with some news about Monte. Meanwhile, Jude has trouble moving on from the trauma of the shooting incident.
When Lena’s half-brother Nate comes for a visit with Lena and her parents, Lena aims to get an apology for an offensive name he called her mother years ago. Meanwhile, Cole invites Callie, Jude and Connor to an LGBTQ prom.
Callie convinces Brandon to head out on a mysterious trip that brings them to Mexico. Stef and Lena discover an empty pregnancy test box in the trash and wonder if someone in the house is worried they are pregnant.
Callie thinks she's celebrating her 17th birthday with just the family, but Jude surprises her with a house party. Jude's surprise risks exposing both Callie's and Mariana's secrets when he innocently invites Rafael and Wyatt to attend. Meanwhile, Brandon's suspicions about AJ's behavior come to a head, and Mariana and Callie decide to buy a car together without telling their moms.
Stef and Lena hesitate to give their blessing when Mariana’s biological grandfather tells her she must be baptized in order to be her new half-sister Isabella’s godmother. Callie’s actions at her birthday party are called out by Stef, and they make a big decision in order to avoid jeopardizing her adoption.
Callie is now officially adopted into the Adams Foster family and must put aside any romantic feelings for Brandon. She does so by throwing herself into her “Fost and Found” website, even drawing the interest of an investor.
Brandon is upset when he learns that his shared secret with Callie is in jeopardy. Lena and Stef’s mother, Sharon, disagrees over how Stef should handle her diagnosis. Meanwhile, Mariana’s run for junior class president heats up as the simmering resentment between her and Lexi comes to a head.
Callie is surprised to find that Jude is spending time with Jack, a quirky foster teen they met at a foster youth event. Brandon and Mat decide to write a Romeo & Juliet rock musical as their senior thesis project, but they disagree over who should play Juliet. Meanwhile, Jesus asks Ana about the identity of his and Mariana's birth father.
After Callie and Jude discover Jack is being abused by other boys in his group foster home, they turn to foster care advocate Justina to get him help. Jesus attempts to get to know Gabe at work even as Nick urges him to tell Gabe the truth about who he is. Meanwhile, Mariana is surprised when Nick asks her out.
While Stef recovers from surgery, she and Lena grow concerned when they find out Justina wants Callie to support a legislation that they know nothing about.
Stef begins teaching a class in the police department’s youth outreach program, but she soon realizes that it is not as easy as she thought it would be.
Jesus is upset after his plans for a low key birthday are supplanted by Mariana, who plans a huge dance party instead. Jude is excited by the prospect of a weekend visit with Connor. Meanwhile, Callie and Brandon strike a truce by agreeing not to bring their new respective significant others home or to family functions.
Brandon plays referee between the two stars of his show, Mariana and Mat. Callie testifies on behalf of Daphne in an effort to help her get her daughter back.
As Brandon debuts his “Romeo and Juliet” rock musical, moments in the production are hitting home for the Adams Foster family, causing them to look back at recent events.
A tragic loss brings the family together. Despite Callie’s hesitation, Justina moves forward with the Fost and Found launch party. Brandon tells his moms that Cortney has a son.
