WHAT IS THE BEST WAY TO INTRODUCE MALE CATS ?

I HAVE 2 MALE CATS 8mos OLD THAT ARE BROTHERS AND BEEN TOGETHER ALL ALONG.... DUE TO FAMILY SITUATION I NOW HAVE MY DAUGHTERS CAT 4 YR OLD MALE.
THE OLDER CAT IS NUETERED, AND THE YOUNGER WILL BE AS SOON AS MONEY ALLOWS. WE HAVE HAD A CAT FIGHT THAT WAS INTENSE BUT NOT HURTFUL, FROM THEN ON I HAVE KEPT THEM APART BUT THE YOUNGER STALKS THE OLDER GUY AND HE IS A VERY NERVOUS FELLOW. WILL THE NUTERING REDUCE THIS? WILL THEY ALWAYS NEED TO BE WATCHED ? EVEN IF THEY DO BECOME CIVIL?

Asked by Member 1088023 on Jan 29th 2012 in Behavior & Training