I'm not sure you can 'demand' them to get along. Frankly, I would be separating them and work on being able to 'do that' without a problem.
It actually may be more of a problem in the future and one may end up dead if they are fighting badly.
And I think having a female around that comes into heat may be a problem between the two of them as well?
I really don't have any suggestions for you, if me, I'd be separating the males and working them individually .
A male I had once, reintroduced to his brother when they were 12 weeks old, they hated each others guts, they could never be together or there was surely a fight going to happen. (I didn't have both of them, just one)
I would speak to your breeder , maybe they can give you some training tips/suggestions.
Danger Danger vom Kleinen Hain aka Masi
"Angel" Jakoda's Bewitchen Sami CD OA OAJ OAC NGC OJC RS-O GS-N JS-O TT HIC CGC
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"Angel" Jakoda's Jagged Edge