A few weeks after the terrible car accident involving Mariana, Jesus and their pregnant biological mother, Ana. As the family deals with the aftermath of the situation, 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.

When Rita's daughter shows up unexpectedly, Callie sees a different side of Rita and learns the reason behind their strained relationship. Stef discovers a new lead in the hit-and-run case. Brandon confronts his moms about the tensions in the house.

The family heads to Idyllwild for Brandon's music competition where long-held feelings are revealed and life-changing secrets are unveiled. Callie finds herself in danger of being hurt when she questions Carmen and Brooke's motives directly. Mike witnesses an unexpected connection that may support Stef's theory for finding the hit-and-run driver.

Amid tensions in their own relationship, Stef and Lena host a 40th anniversary party for Lena's parents. Callie faces the judge who will determine the consequences of her actions, all while holding a secret that could change everything. Meanwhile, Mariana decides that she must find a way to repair her relationship with Mat.

Former foster teen Callie is now officially adopted into the Adams Foster family. She must put aside any romantic feelings for Brandon and does so by throwing herself into her "Fost and Found" website, even drawing the interest of an investor. After his performance at Disney Hall, Brandon is approached by a recruiter from Juilliard. Mariana launches her campaign to run for junior class president while Jesus tries to hide the reason why he doesn't want to go back to wrestling school. When Mike discovers a secret his foster son, AJ, is keeping, he is torn about what to do with the information. Jude must face the fact that his boyfriend has decided to move away, and a serious medical issue for Stef results in a clash of opinion between her wife, Lena, and her mother, Sharon. Meanwhile, Sharon introduces the family to her liberal-minded friend, Will.

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.

When Stef and Lena discover Callie wants to film an endorsement supporting a new foster care reform bill, they express concern, prompting Callie to seek out Rita for support. Hoping to impress Mariana, Nick turns to Jesus for advice on planning their first date. Meanwhile, Stef recovers from a medical procedure.

Brandon's senior thesis is in jeopardy when a student raises concerns about the play glorifying sleeping, leaving the school honor board to vote on whether or not his Romeo and Juliet musical can be performed at Anchor Beach. Rita's daughter Chloe reaches out to Callie after Rita refuses to take her calls. Meanwhile, Stef teaches a class on handling emotion as part of a Youth Outreach Program.

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.

During a rehearsal for Brandon and Mat's "Romeo and Juliet" musical, Zoe tells Nick that Mariana cheated on Mat when they dated, causing Mariana to fear that Nick will end their relationship. Callie serves as a character witness for her friend Daphne, who is desperately trying to get her daughter back. Meanwhile, Jesus and Mariana want to help their birth father.

As they perform the parts of Romeo and Juliet on the show's big opening night, Mat and Mariana are forced to face the depth of their feelings for each other. The musical performance sparks heightened emotion for members of the Adams Foster family, causing them to reflect on recent events. Meanwhile, a domestic violence call leads Stef to a tragic discovery.

Callie makes a shocking discovery following a tragic loss; Mariana feels guilty after Nick gives her an expensive present; Brandon find himself in a dilemma after Cortney's ex-husband kicks her out of their apartment.