Should I report my sister for domestic violence?

she's 33, and her boyfriend is 41. I'm 30 I'd that even matters. Anyways, I was just talking to my sister, and she said that her, and her boyfriend of 15 years fight a lot. She said he's never hit her. I said I'd try in kick his ass if he did, then my sister brought that she pushed him once, and that she punched in the shoulder. She said it like it was a joke, and she said that she can't hurt him, and that it's okay for her to do it, because she's a women, and he's man, but then she said she's just kidding. This is domestic violence isn't it? I really don't want to, but do you think I should report my sister to the police

Should I report my sister for domestic violence?
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