That depends. You want a clinical definition of one or what I think a father is?

[ Sorry. He had to sass a little bit, even now. Though his expression does turn a bit softer in that next moment ]

A father is someone who's there for his children. Someone who's there when they need him. Just like you were there for me after Kurama's execution. You helped me out... I still owe you one for that.

[ He holds up one red-gloved hand. ]

You even wrapped up my hands that night, too. Something my own father never really did for me.