I have know someone who is at her wits end with a cat. he is 14 weeks old in a multi cat household is aggressive with the other cats to the point that they avoid him and he took over another cats territory. Aggressive with humans in biting to the point of producing blood. Does not cuddle only bites. He is not fixed and not planed to be till he is 5 months old and lives with a '4 years in 2 moths' old human boy who likes to purposely scare the cats. Any advice i could give her?