Mom and Daughter

Met an older woman at a bar last night. She wasn't bad for 57, we drank and bullshitted a bit, then she asked if I'd ever had the 'sportsman's double', a mother and daughter threesome? I said no. We drank a bit more, then she says that tonight was my lucky night. I went back to her place. She put the hall light on and shouted upstairs: "Mom you still awake?"