My two year old cat keeps biting and hissing I have tried several calming products but nothing seams to work help I am getting worried as there are small children

Is this something new? If so, take the cat to the vet, there's something wrong with it. It could be injured.

Has anything in it's environment changed? Food, animals, people, anything at all? It sounds like something has your kitty unsettled and he's not adjusting well.