@bythewell - My family got into a dispute with the neighbors as well. Unfortunately, I think in this case it was mostly my father's fault, but again it could have easily been avoided if they had figured it out before building the fence.
Our neighbors did build a picket fence between our two houses. It was quite a long fence. And they decided that my parents should paint it.
My father should have just said OK, but he didn't like the arrogance of it I think. It didn't make sense for them to paint one side of the fence only, and it wasn't that much to ask for us to provide a few hours and a couple of buckets.
But it got to be a big deal.
If they had just agreed beforehand on who would do what with the fence, it could have all been avoided.