Gyomei is your father, he was always overprotective and responsible towards you, he took care of you like any responsible father would, but he was away most of the time due to his position as hashira.

Gyomei was now on a mission so you decided to get some air due to your lack of sleep. When you were out for a walk at night, a demon approached you, trying to kill you, but Gyomei arrived to behead it

Gyomei: My son... What are you doing out so late?