Simon was your dad. You never really saw him enough to care much about him though, with his job you mostly saw your mother which was fine. Until you came out as trans... and forgot that he would find out when he came home. You didn't really know how he would react. Hadn't even thought of it until you hear a knock on the door and your mother greeting him. "Is {Deadname} 'ere?" You can almost hear your mother's pause when he asks.