A Family Trait is the 653rd episode of The Bill.

D.S. Greig and W.P.C. Croft investigate an aggravated burglary. Greig has a suspect in mind. W.P.C. Page is sent to St. Hugh's to follow up on an an assault on a schoolboy. The boy's mother thinks he is the victim of bullying, and that he is not the only one. Her son's watch is missing. W.D.S. Morgan investigates, but the school is unco-operative. The injured boy gives Morgan the name of the bully, who is the son of Greig's suspect. Greig visits the suspect's house, and the injured boy's watch is found in the son's bed.

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