“The Fosters” is a compelling, one-hour drama about a multi-ethnic family mix of adopted and biological teenaged kids being raised by two moms. Stef Adams Foster, a dedicated police officer, and her wife, Lena Adams Foster, a school vice principal, have built a close-knit, loving family with Stef’s biological son from a previous marriage, Brandon; their adopted twins, Mariana and Jesus; and newly adopted siblings, Jude, and his half-sister, Callie. As the third season of “The Fosters” continues, 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 focuses his energy on his music, working with Mat on a musical for their senior project. Mariana’s relationship with Mat is still estranged, so she turns her attention toward running for junior class president. Jesus makes a friend who is into street racing and, at his prompting, questions Ana about his biological father. When Mike discovers a secret that 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 while a serious medical issue for Stef results in a clash of opinions between her wife, Lena, and her mother, Sharon.