I breed wild type mice. I would not put the father in with the weaned males. Mice only due well if they have been raised together and even then males can get aggressive.
I don't think its hard at all. I will say that my males do tend to get aggressive around breeding age. They usually start beating up on the weakest member of the group. I feed that one off and they restructure and start beating up on the new low man. So hear is my advice. Get 4 tubs, I go with 2 that have about the floor space of a 10 gallon aquarium and 2 that are one size up from that. I then have a shoe box sized tub in case I need to separate one. Get 5 cheep water bottles and some food. I feed http://www.kaytee.com/products/kayte...-mouse-rat.php because I can get it locally. If you are breeding on a larger scale than I am there are many posts on cheaper food. Then my process is simple. Get 1 male and 2 females and put them in one of the larger tubs. Wait till you see your females looking like visibly pregnant. Its pretty obvious once you have seen it a few times. Then take the male out and put it in a small tub. When the babies are ready to ween, split your mice into males and females. Whatever you have more of goes in the remaining large tub and whatever you have fewer of goes in the smaller tub. Then grow the babies up, I wait till they are 30 grams. Then feed the males (stinkier and more aggression issues) followed by the females. If you need to breed again get another two tubs. I like to have more setups than I have mice just in case. Its also much easier to clean if you can just move a group of mice to a clean setup, clean the dirty setup and repeat. I don't worry about inbreeding because what I do is way better then what they do for lab mice. But if you are worried, you can save two female weanling, grow them up and buy one more male to get a new trio. Good luck.
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