In the episode titled "I Do," Stef and Lena try to maintain calm when their parents descend on the Foster house for a very special celebration. Lena's dad, Stewart, has agreed to officiate the ceremony while her mother Dana and Stef's colorful, talkative mom Sharon, attempt to keep things civil while disagreeing on floral arrangements. Sharon tries to strong-arm Frank into attending. Stef avoids telling Lena she plans to return to work as soon as she is cleared. Meanwhile, when Callie's case against Liam boils down to her word against his, she must decide whether or not to lie in order to get some justice out of the situation. Callie and Jude get some news they've been hoping for, but Callie makes an emotional slip that could destroy any chance they finally have at happiness.

Callie meets Rita Hendricks, a woman who works in the foster care system, and it's clear it will take Callie some time to adjust to Rita's no-nonsense guidance. Brandon comes clean about the reason Callie ran away and, unbeknownst to Stef and Lena, he sets out to track her down. Meanwhile, Mariana volunteers to help with the school play in order to impress a cute boy, but when she gets paired up with an old "friend," it could spell trouble. Jesus' meds are having concerning side effects, and he's desperate to find an alternative to taking the pills. Mike suggests he participate in contact sports to help relieve his aggression, and Jesus tries out for the wrestling team.