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Really? I whole heartedly agree with the rest of your post. That cat is dangerous, and cat bites are one of the worst possible bites to get. But their saliva is certainly not toxic, and their incisors are absolutely nothing like hypodermic needles (in fact, their incisors are practically harmless...they're tiny, almost as blunt as our incisors, and the only thing most carnivores including cats use their incisors for is plucking hair from their prey before eating it or "flea biting" to scratch an itch). Their canines certainly can be sharp, certainly a more pointed sharpness than a dog's canines, but even then they aren't even half as sharp as hypodermic needles. The danger from their bite comes from the bacteria in their mouth, which can fester in a wound and cause septic infections in some (although not all) people. Their claws can also harbor some pretty nasty bacteria which makes cat scratch fever a very real and dangerous possibility. People with a weakened immune system should always seek immediate medical attention if bitten or scratched by a cat because the risk of a severe and even life threatening infection is very real. But most healthy adults will be ok with just washing the wound thoroughly with soap and water. Working at a vet's office I've been scratched countless times and even bitten a few times by many cats of various health status and have never had the wound become infected when washed immediately. That's not to say I don't keep a close eye on any cat bites I get, but I also don't run to the emergency room as soon as it happens either.
To the OP, I'm not really clear on the situation here. Do you live with your sister? Does your sister live with your mom? If your sister is living on her own, unfortunately there isn't much you can do about the cat. If she is living with your mom, then the only thing you can really do is to plead with your mom to lay down the law and get rid of the cat. If you're living with your sister, then you may just have to move out if you don't want to deal with the wretched thing any more. You can try looking up websites on the horrible things that can go wrong with cat bites/scratches and show them to your sister and try to explain to her how much danger she is putting her child in by asking him to take care of the cat and keeping an aggressive animal in her home. You could try pointing out to her that if this were a dog, DCFS would be on her case so fast for putting her child in harm's way by knowingly keeping an aggressive animal. But ultimately it's up to her to make that decision, and it sounds as if you or your mother trying to show her the sense of the situation may only make her more blind to what needs to be done.
