Yeah, I'm not super close to the neighbors but Ifeel like if your neighbor's kids are routinely on your property, you should at minimum know their names and have their phone numbers! LW's first step here isn't working out a custody schedule it's having any kind of actual conversation with the parents at all. (And I'd start with addressing the stuff on your porch, because either the parents are actively encouraging that or they don't know their kid is getting pet supplies somewhere. If they are encouraging it, point them toward periodic shelter donation/look at cats days instead.