If he cut your lock to get in it is not just trespassing but burglary. File a report, to everybody who will take one. Animal control, SPCA, Police, Child Welfare. The parent who was not concerned that is child was hanging with a man who would beat a chicken with a rock deserves to be reported.
You might want to look at getting a game fowl rooster. With 3 inch spurs and flailing in your face they can get a burglars attention real fast.