Hi mazmich13, i have a brother and sister pair living together and they get on really well, they are both 7. They used to live separate up until a month ago as i was worried about inbreeding but my female hasn't called now since june so i think she has now finished breeding. It wasn't like they had been apart at all, they sleep in the same box, eat out of the same bowl and enjoy each other's company. When they lived separate i let them out together to runaround but i've only recently started letting them out about six or seven months ago, never thought about it until i read on here about letting them out. I was luckly that after all the time apart they got on well, didn't fight at all when they were let out together. None of my males are neutered so my young white is kept separate at the moment but he is a little young at the moment anyway, about 7 months. I suppose i never neutered Ginger because i wondered about the danger of the anethetic and thought i might change my mind about not breeding him in the future, he is a very good looking male.
As Nate said the best option would be to neuter your male if you want to keep him with the girls while they are young.