I have a neighbor like that. The solution is simple – – windchimes!
We have a rental behind us that can’t seem to keep its renters. The current one asked me if I could move my wind chimes. They’re huge and sound like church bells. My reply.......when you can get your kid to quit crying all day in the backyard.
I would never have said a word even though the kid, she sounds about 2, cries over every little thing all day long while playing in their backyard. But she had to open her mouth. Lol