How can my manage my cats?

You don't mention if the oldest cat is fixed; I'm uming not since he's gone so much. He's erting his dominance w/the other male. Your problems will increase when the female reaches breeding age and comes into heat. Meanwhile; they will probably settle down some once each accepts their status in the family hierarchy. Then the oldest will mostly ignore the others; tho every once in a while the males will scrap to determine dominance. You also may have problems w/the males marking their territory. They will compete; if your lucky-outside.