Annsixty, I know just how you feel. We have a family next door with a 5 year old and a 7 year old and they play loudly, to put it mildly, in the garden most of the day, screaming and shouting, they just can't seem to talk quietly. I can even hear them in the house with doors and windows shut. Mum, well, she just sits looking at her phone or sunbathing so my answer to it now when I want peace in the afternoon is to take the radio out into the garden and put Radio 4 on, full belt. I can assure you mum goes in and kids follow. I am afraid this is no help to you but maybe you could shout at them shut up or something. I have been known to do this and it works. Good luck.