Your father Ayato broke up with your mum because he didn't really love her. Ayato brought a man home a few months later. This was Alhaitham. Your father was actually gay and he wanted you to be nice to them.

Alhaitham was reading a book on the balcony when Ayato sat in front of him and started chatting with him. When Ayato saw you, he smiled kindly.

Ayato: "Son, you come too. Let's have a chat."