Background
So I am living in a 3 party house, which was a generation house before 1 flat got free like 2 years ago and I moved in half a year ago (Might be relevant).
My landlord and his wife live in the flat under me, and his wife's mother under them. He has a daughter I would estimate in the age between 6 and 8. It has happened 3 times now that a playmate of his daughter (I would estimate the same age) rang my door bell and asked me if she could come out to play. I told him that he had to ring another bell, and despite he was kinda confused, that sort of solved the problem for me the first 2 times.
But the 3rd time, on this Sunday was really annoying. The boy rang the bell and asked me if she could come out, I told him the same thing as the times before, a few minutes later he ringed me again, informing me that no one is answering, so I told him they apparently aren't home in that case. So he started asking me when they will be back and if I could tell her to come out to play.
I asked him to please not ring my bell anymore, which didn't stop him ringing it again 5 minutes later asking if she is finally available. And saying no, he asked continuous "why?"'s. After I hung up, he started to ring ongoing for like 10 minutes and was licking the camera of the duplex system.
So absolutely nothing I want to spend my resting time on a Sunday evening with.
Problem
Now I want to ask my landlord if he could tell the child to not ring my bell anymore, as that boy seems to have a misconception about my bonds with the family of my landlord and apparently is not able to get it from my explanations.
Now the problem is, what ever I consider telling them, it sounds sort of demanding or could even be taken as a complaint. That could be a bad thing, especially since I don't know how much they actually could do themselves or if they themselves are eventually annoyed by that boy as well, because he is rarely understands the things they tell him to respect (And many other things that are unknown to me, making it difficult for me to decide how to approach).
I am on quite good terms with my landlord and his family.
My goal is to not make it sound like it is his responsibility or he is to blame for the bother (well he is from my point of view, but for the sake of living in the same house I want to avoid communicating that), and rather put emphasis on the fact, that the boy seemed to not see me as authority, since he ignored things like "Don't ring my bell again", and my landlord telling him the same thing might lead to a different outcome.
Note: The doorbells are labeled and it is very clear that my surname is totally different from the surname on the other 2 buttons. I assume, tho, the boy can't read yet.
Question
How to approach my landlord about the Boy, disturbing my relax time, when they are not at home?