Just when Riley and Ben are finally about to get together, Emma's mom will show up.
Because it's bound to happen at some point, right?
Emma's mom shows up at some point and reveals that the baby actually isn't Ben's, and that she's here to take Emma away.
And after a heart-wrenching episode, Ben finally grows up and realizes that it doesn't matter if Emma isn't his biological daughter—he loves her anyway and won't give her up. The mom is touched, and decides to stick around and get to know this "new" Ben. Hijinks ensue.
- Partly Jossed, partly confirmed. She does show up but the really is Ben and hers. And after seeing Emma, she wants at least partial custody of her.