Why is my cat suddenly acting aggressive and attacking my male cat?

Cats will swat at each other a little when they get annoyed, so I wouldn't worry too much about the situation wih your younger black cat. As for the serious fights going on between the other two, They need to be separated. Can't tell you what's going on with your white cat. Is she fixed? Some females get very aggressive when they're going into heat. It's also possible that she has something medically wrong with her, so you might consider having her looked at by a vet before you make the decision to give her away.