Alright cat and kittens for once I'm not being a jerk, could you give me some advice on something I saw today?

Alright, so there's this kid that rides around the neighborhood on her bike in the afternoon. I see her when I'm coming home from work. One time she was stopping and starting on her push bike funny, I asked if she was alright and she said all good and since then when I come home she waves and I wave back. Anyway. I'm coming home today and she's out with her little sister, she waved at me and started babbling on about something but I couldn't hear her because she was so far away. As I got close I laughed and asked her why her sister had taken off her helmet and kicked it. Then this man comes wandering down the pathway. And he was messed up!! He looked drunk out of his head. He had a scotch glass in his hand and everything, he had his bottom lip stuck up like Bubba from Forrest Gump. He starts snarling at her to stop riding her bike. She's saying, that's the nice man who asked me if I was alright. This guy is snarling her name and at some point she calls him Dad so I thought, righteo, that's her Dad. Then when she's holding onto the bike, not on the bike, but holding onto it, he tugs it away with his free hand and starts dragging it up the path. Now maybe I'm just seeing things that aren't there but, he was drunk as a skunk with a massive scotch glass in his hand nearly filled to the brim while roaring in the street t one of his kids. I guess what I'm wondering is, are those kids in danger and is there even anything I can do? I grew up with a drunken abusive father and a drunken abusive family and I wouldn't want anyone else to go through that.