VIDEO: Sneak Peek - Summer Finale of ABC Family's THE FOSTERS

Callie turns to her biological father when she learns Rita and the Girls United foster group home are in dire need of support, but her good deed threatens to backfire in the Summer finale of "The Fosters," airing Monday, August 18 at 9:00 p.m. ET/PT on ABC Family. Get a sneak peek below!

In an effort to help Rita with a dilemma involving Girls United, Callie calls in a favor from her wealthy biological father, Robert Quinn. But an unexpected Betrayal threatens to derail the new bond she's forging with the Quinns.

Meanwhile, the pressure Connor faces from his father to end his friendship with Jude intensifies and leads Lena to make a life-changing decision. The tension mounts between Brandon and Lou, despite their bandmate Mat's warnings against drama. And a visit with someone from his past makes Jesus see his relationship with Hayley in a whole new light.

The episode, titled "Someone's Little Sister," was written by Joanna Johnson and directed by Norman Buckley.

Winner of 2014's GLAAD Media Award for Outstanding Drama Series and 2013's Teen Choice Award for Choice TV Breakout Show, "The Fosters" is executive-produced by Jennifer Lopez, ("American Idol," "What to Expect When You're Expecting," "The Back-Up Plan") and created by Bradley Bredeweg and Peter Paige ("Queer As Folk"), who also serve as executive producers and writers, along with Joanna Johnson ("Make It or Break It"). "The Fosters" stars Teri Polo ("Meet the Parents") as Stef Adams Foster, Sherri Saum ("In Treatment") as Lena Adams Foster, Jake T. Austin ("Wizards of Waverly Place") as Jesus Adams Foster, Hayden Byerly ("Parenthood") as Jude Adams Foster, David Lambert ("Aaron Stone") as Brandon Adams Foster, Maia Mitchell ("Teen Beach Movie") as Callie Jacob, Danny Nucci ("Titanic") as Mike Foster and Cierra Ramirez ("The Secret Life of the American Teenager") as Mariana Adams Foster. Greg Gugliotta, Elaine Goldsmith Thomas, Benny Medina, and John Ziffren also serve as executive producers. The series is produced by Nuyorican Productions, Inc., and Prodco, Inc.

Part of the Disney/ABC Television Group, ABC Family is distributed in over 97 million homes. ABC Family features programming reflecting today's families, entertaining and connecting with adults through relatable programming about today's relationships - told with a mix of diversity, passion, humor and heart. ABC Family's programming is a combination of network-defining original series and original movies, quality acquired series and blockbuster theatricals. For 2014, ABC Family has launched the "WATCH ABC Family" authenticated service which allows viewers with participating TV subscription services access to 24/7 live viewing of the network, as well as continued on demand access to such popular series at home and on the go via a wide array of devices. ABC Family is also the destination for annual Holiday events with "13 Nights of Halloween" and "25 Days of Christmas." ABC Family. A New Kind of Family.

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