<Li> Mary Mouser as Sarah (season 1 - 2): A foster child in Callie's foster child support group who was staying with Liam and his family . Callie became worried for her safety upon learning Liam was with her . She was then taken out of Liam's home after Callie confessed to Lena and Stef about Liam assaulting her . </Li> <Li> Sam McMurray as Frank Cooper (season 1, season 5): Stef's late father, who struggled to accept Stef's relationship with Lena . He dies in "Family Day", deeply affecting Stef who regretted never making amends with him . A vision of Frank appears to Stef in season 5 . </Li> <Li> Annie Potts as Sharon Elkin (season 1 - present): Stef's supportive mother and ex-wife of Frank . </Li> <Li> Lorraine Toussaint as Dana Adams (season 1 - present): Lena's mother who is oblivious to Lena's biracial struggles . The two have something of a rocky relationship, due to Dana not seeing Lena as a "real" African American woman, but Dana is there for Lena when she needs it . </Li>

Who plays stef's mother on the fosters