Good news first: I got a couple of new baby budgies!

I now see that one is male and one is female, giving me a total of three females and one male. I thought she was a male, but it's so hard to tell when they are young! I'm really worried about the girls fighting over the boy. Does anyone here have uneven numbers? Does it work out okay? I can't keep them separate forever. The newbies are in quarantine for couple more weeks, but the idea was to get a couple more to fill up my huge new cage and give my girls some more friends.

Is this going to work?