My house is a zoo! HELP!!!!!!!?

my b-day is coming up and my parents will either let me get a ''free to good home'' kitten from the paper or a ferret from petco but I don't know! I already have three dogs, an electric blue lobster, a rope fish, a plecostomas, and my two year old ferrets mittens and woozel and my 3 year old cats kiki and waffle but iam afraid if i get a kitten waffle will destroy it! (he is a 12 pound bengal cat with an anger issue! HELP!!!!!!