a question about -The Dark Knight

i Wanna know how joker got those scars on his face, himself or his father?
see below-
The Joker: Come here. Hey! Look at me. So I had a wife, beautiful, like you, who tells me I worry too much. Who tells me I ought to smile more. Who gambles and gets in deep with the sharks... look at me! One day, they carve her face. And we have no money for surgeries. She can't take it. I just want to see her smile again, hmm? I just want her to know that I don't care about the scars. So... I stick a razor in my mouth and do this...
& also.
The Joker: Wanna know how I got these scars? My father was....a drinker. And a fiend. And one night he goes off crazier than usual. Mommy gets the kitchen knife to defend herself. He doesn't like that. Not. One. Bit. So, me watching, he takes the knife to her, laughing while he does it. Turns to me and he says "Why so serious?" Comes at me with the knife,"Why so serious?" He sticks the blade in my mouth. "Let’s put a smile on that face!" And..... Why so serious?