You shouldn't make your family afraid to come home.
Bob's family was mad at Bob, and they made him stay home while they went to the fair.
Bob wants revenge on his family.
Bob quietly sits in his room and decides not to talk to his family.
Bob tries to scare his family by making the house appear to have an intruder.
After a few days his family apologizes and all is well.
Police officers see the scene and think Bob IS the intruder.