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.

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.

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.

As Stef and Lena stand vigil over an unconscious Jesus, he dreams of an alternate world wherein he tries to save Mariana but can’t get to her. Already stretched thin, the moms receive news that Callie is in serious legal trouble. Mariana seeks comfort in Mat’s arms, while Brandon tries to hold the family together.

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.

When Rita’s daughter shows up unexpectedly, Callie sees a different side of Rita and learns the reason behind their strained relationship.

The family heads to Idyllwild for Brandon’s music competition where long-held feelings are revealed and life-changing secrets are unveiled.

When Jesus’s birth father, Gabe, doesn’t show up to work on Stef and Lena’s garage, Jesus takes on the job himself and gets injured in the process. An exhausted Mariana, deep into her robotics STEAM project, takes Jesus’ ADHD medicine for a boost. Callie and AJ find themselves in an awkward situation when Mike and Brandon unexpectedly come home early. Meanwhile, Stef lets Mike know that Brandon gave his hand injury settlement money to Cortney.

Mariana and Jesus compete in the First Robotics Southern California Regionals, but when Mariana gets too competitive under the stress, Lena grows alarmed. Callie gets a warning from the police to stop harassing Patrick Molloy. Brandon practices for his fast-approaching Julliard audition.

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.

Amid tensions in their own relationship, Stef and Lena host a 40th anniversary party for Lena’s parents.

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.

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.

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.

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.

After Brandon confesses to Stef that he didn’t get into Juilliard, she decides she’s fed up with all of the kids’ secrets and removes their bedroom doors. Mariana starts seeing a therapist to deal with the trauma of Nick’s actions. While Jesus struggles with physical therapy, Brandon realizes that music might be a good way to help get through to him. Callie’s biological father Robert brings in his highly paid attorneys to handle Callie’s case, which causes a conflict with Stef and Lena.

In the aftermath of the school lockdown, Mariana is called out by other students who blame her for Nick’s actions. Callie is also taunted at school and her inappropriate reaction gets her suspended. But what starts off as a punishment turns into an adventure when she meets Aaron, a handsome young law student who knows nothing about her or her past.

Callie starts her senior project of photographing the outside of her and Jude’s seven former foster homes. But, when an unexpected encounter with a former foster mother brings her inside, Callie decides to reach out to other people who have fostered her and is shocked to learn that a 17-year-old former foster brother has been convicted of murder. Stressed out by the hardships of supporting himself and Cortney, Brandon throws a house party and things take a turn for the worse. Stef and Lena offer to pay for an attorney to help get Gabe off of the sex offender registry, which is currently putting Lena’s job at risk and causing friction between Mike and Ana. Meanwhile, Mariana tells her moms that, in order to feel safe again, she wants to visit Nick and put an end to their relationship once and for all.

Stef confronts her demons and finally comes clean to Lena about what’s been troubling her. Mariana and Emma find themselves going head to head, putting Poppy and Jesus in an awkward position.

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.

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.

Lena is shocked by the news that her dad has been hiding something that directly puts them all in jeopardy. Additionally, she uncovers a major secret that Brandon has been keeping. Mariana continues to be pressured by Nick and must deal with direct opposition from the male members on her STEAM team. Meanwhile, Jesus grows resentful of Emma’s behavior, and Jude discovers Noah has a medical marijuana card.

Callie tries to keep to herself and focus on getting out of juvenile hall, but when she refuses a guard’s propositions, she ends up making an enemy. As Stef and Lena work to get Callie out of juvie, her biological father Robert turns up, angry for being kept in the dark. Meanwhile, Brandon’s questioning of a situation has consequences for Mariana. Jude gets a second chance with Noah, and Mike makes several life-changing decisions.