Go to their homes and ask to speak to their mothers. You may need to take someone (preferably female) who is fluent in Arabic.

Explain calmly "Your child is throwing stones at me and I would like him to please stop" - no drama, no tears no histrionics. Just say it in a polite tone, no "he's a terrible child with no training" - that's an attack on the family and will not be tolerated.

In my experience, (and I've had this same thing happen to me elsewhere in the Gulf) the mother will be embarrassed, agree that the child shouldn't be acting that way, and in my case, invite me in for tea.

Hope this helps.