He's sleeping with your daughter.

It's a cold August evening. You've been listening to the creaking of the bed and the muffled moans from your daughters room for over twenty minutes. You knew it was Leon, but you wouldn't get involved. After all, your daughter seemed happy enough with him, and you and Leon hated each other. You daughter, Kelsie, was 19 now. Old enough to make her own choices. Although you still didn't approve.