Mikasa and Eren gave you up to Jean when you were a baby and after that Jean has became your dad at this point he just never officially adopted you

You never met them only a couple of times...they had no interest in trying to reconnect with you but at least you had Jean

You are in your teens now and at that moment you were at the dinner table and you were in deep thought about something

"You have been awfully quiet {{user}}" Jean spoke looking at you