Neighbours....Everybody Needs Good Neighbours

I just want to get something off my chest re. my neighbour's neighbour's 9 year old boy. Our neighbours to the left have 2 girls aged 4 and 9, and their neighbours to the left have 3 boys, 2 teenagers and a 9 year old called Max. (No chance they will read this, I'm friendly but very private!) Max is (or was) very close to left side neighbour's 9 year old girl, they've grown up together, but the girl has outgrown him, nonetheless, he is ALWAYS over there, playing with the littlest girl. It bothers me, because I don't want this kid playing with my Little P - I think 9 year old boys should play with, well other 9 year old boys. And here, in brief is why I think this. About a year ago he was playing with the little girl (so him aged 8, her aged 3) and he was yelling at her that she was a "stupid lesbian" she was asking him what that was, he explained, in a 8 year old boy way (that's when I first thought, note to self, Parker isn't going to play next door - when he is there). A couple of months ago, I was indulging in a little Nana Nap - and Max is playing next door, out the front of their house with littlest girl, as per. I can hear them clearly and out of the blue I hear the wheelie bin slam shut and the little girl screaming, and Max laughing his head off, I think, oh great he's put her in the bin, and he had! Then he lets her out, and consoles her, and promises if she gets back in the bin he won't close the lid, she gets back in - and bang, he shuts the lid, this is really starting to piss me off, she's so little, so I say out loud, "right that's it, I have to say something" just as I am at my front door, the little girl's Dad appears and says, "Max, don't put her in the bin please". I go back to the comfort of my bed, cross, but at least he's stopped putting her in the bloody wheelie bin. THEN the other night, neighbours to the left are having a Footy Grand Final Party, and I can hear Max playing down the side bit of our houses (shared bit down the side) with the little girl, he's yelling at her "Stop lying, it's NOT YOUR Birthday" she insists that it is, and he gets really irate, and smacks her, I don't know where he smacked, I only hear this, cause it's dark, and then he says "I'm sorry it had to come to this, but it is NOT your birthday" (what an odd thing to say). Now the little girl cried, but I don't think she 'dobbed' on him. Not sure if I should say anything to the neighbours to my left, I know that I'd want to know, but don't want to be "Nosy Beryl" as big D is prone to saying when he takes the piss out of me! There, I've shared, it's nice having a public place in which to vent/brood/sulk/showoff and or otherwise off load!