Seems reasonable to not shoot within 150 yards of someone else’s property, regardless of what kind of structures or areas exist there.
Still sounds like you might have an uphill battle. I say try to kill them with kindness and win them over to your way of thinking. They will probably *always* shoot on their property, but if you make nice with them and explain to them your concerns, especially regarding your kids’ safety, maybe they’ll be more open to working with you.