
BYC members don't mean any harm and there are many different personalities here.
I am usually straight to the point with no malice intended.
So the neighbor has a problem with your kids and your chickens?
You can fix both of those issues easily.
Practical advice asked for by you:
Keep your flock and your kids off his property.
Once the issues are settled, you will be able to relax and enjoy your kids AND your chickens.
Best wishes!