Michael "Mike" Foster (season 1–present) is a San Diego police sergeant, Brandon's father, and Stef's ex-husband and ex-police patrol partner. As the series progresses, it is revealed that Mike has a drinking problem, but joins AA to cope with it. A frequent visitor to the Foster household, Mike is familiar with his son's family. Toward the end of the first season, he started dating Dani, who helped him to keep his sobriety. However, he soon discovers that Dani had sex with a drunken Brandon one night and arrests her for statutory rape. Since then, Mike helps Ana come to terms with her addiction and live a clean life.