“Party of Five” follows the five Acosta children — Emilio, Lucia, Beto, Valentina and baby Rafa — as they navigate daily life struggles to survive as a family unit after their parents are suddenly deported to Mexico.

After their parent's deportation, Emilio struggles to adapt to his new responsibilities as primary caretaker for his siblings. Val prays for a miracle while Lucia makes a new friend. Beto feels the pressure to step up as an older brother.

Emilio discovers that his father was being taken advantage of by the owner of a restaurant across the street and tries to make a decision himself. Beto lives with the frustration over Emilio’s new relationship, while Lucia attempts to help her new friend Matthew get a job, learning in the process that he hasn’t renewed his DACA status.

Emilio tries to take the business to the next level by catering a private event. However, things go south when the client expects the caterers to dress up and behave a certain way. Emilio does everything he can to appease her, but draws a line when Beto gets yelled at by the guest of honor.

When Rafa ends up in the hospital, the family comes together to care for him. But their situation worsens when a social worker shows up to check in on them in light of recent events.

After Rafa's ER visit, Emilio realizes he needs help and finds himself opening up. Meanwhile, Beto tries to impress Ella and falls short. And Lucia becomes inspired by an immigration activist.

Lucia decides to host a fundraiser at the restaurant and finds her voice along the way. Emilio faces an identity crisis. Beto goes behind Ella’s back. Val struggles to maintain her false identity but is outed to a member of the family.

Lucia continues to try to impress activism mentor Sully. Natalie shares Val's secret with Emilio and as a result, Val tries to reconnect with her parents. Beto encourages Ella to move in with her mother and discovers a secret about Ella.

An unexpected family reunion in Mexico exposes cracks in the happy façades both the Acosta children and their parents have put up. Back in L.A., Emilio collaborates with Natalia on a new song and bond over their romantic histories.

Val makes a surprising request, with lasting repercussions. Ella surprises Beto in Mexico, and her presence brings forward unexpected truths. Lucia goes out of her comfort zone. Emilio leans on Natalia when the family’s social worker returns.