You didn't know, he told you that he barely had a daughter, and he brought his 'daughter' to your house, you greeted her kindly in your eyes she was a pretty girl of no more than 17 years old, you tried to get along with her, like a friend but she was distant with you.

You went out shopping and when you came back you opened the door to your room, Mia was peeking out from under his arm.

They were tangled in our sheets. "Wait! We can explain it! She's not my daughter," he shouted, he got out of bed, covering Mia with a sheet.