He bites my family

Hi, i have a 1 1/2 yr old Green Cheecked Conure. i had him since he was 5 months and love him very much. i never had too much of a problem with him biting, me anyway. and he still doesn't bit me. but he bites other members of my family. he hasn't drawn blood but is close to it. his cage is in the kitchen (don't worry the fumes don't get to him. if there are too many fumes i move him into another room)where everyone walks by him, would that bother him alot? my room is too secluded and cold for him. the living room stays pretty dark. the kitchen seems to be the best place.
   
when Bonanza does bite we've had always blown on him, which doesn't really work anymore. all i have to do is tell him "no" and he listens but not with everyone else.
   
so, what should i do? thanks