My mum had lived in her house for almost 30 years. For about 25 of those years she has been growing a tree in her garden. It's probably about 2 storeys high.
Recently new neighbours moved in. They do not like the tree. Almost every weekend they have visitors and when they hear my mum open her back door they go into their own back garden and discuss the trees size and how it impacts on the extension they have built - it blocks some light and they don't have a clear view onto the path behind the house.
My mum feels intimidated by this. AIBU to think they should put up with it as the tree was there before they bought the house and built their extensions and they certainly shouldn't make my mum feel intimidated in her own garden?