Protection

My eldest was attacked by drunken youths on friday night with no provocation. He's fine, just a few bruises thank the goddess. My middle lad was also set upon while out with friends in Liverpool a few weeks ago by a gang of 7 lads after his phone. Apparently the same group of lads do this every weekend. He had worse injuries but still came off okay, and with his phone I might add :)

Anyone know of a family protection spell or something similar?