So, my buddies neighbor to his left owns another piece of property to the right of the Moslems. He put up a fence and put in some pigs that are visible to the Moslems. Play with fire and you get burned.
How old are those Moslem “kids”? At some point their harassment of your buddy’s daughter will probably escalate beyond the verbal. I hope he and his daughter and everyone else in the family is armed and prepared.
Your buddy could take a wood chipper and place it on the property line pointing toward the muslim land. Every time one of the punks insults the daughter he should fill the chipper with pig guts then turn it on. Pig guts flying all over the muslim punks.