Starlady, I would never barge in anywhere, I would however, if a phone call or email didn't work, walk the 30 feet and then say we need to talk about the fact that we live in such close proximity and you as you have decided to sever contact , the situation needs sorting sooner rather than later it isn't viable, so confusing to the grandchildren, it's not their problem.
I gather that as you have such a knowledge of estrangement, that you are either still estranged or possibly reconciled with your family. All situations are different, but in this case living in each other's pockets almost, it is particularly hard. I have read how hard it was for Smileless, she more than anyone knows the pain of living so close to her son and family and the upset when they passed close by.mimagine if they are just feet away.
So it begins….. Streeting resigns
it's the OP's D who is being disrespectful.