egg laying in pekins starts usually somewhere in the mid-20s weeks, but mating behaviour can start earlier
A common recommendation is between 4-6 females PER male, and that can often be a low number depending on how aggressive the males turn out to be once the hormones kick in. Also, the more males you have, the better it is to err on the side of extra females instead of bare minimum because multiple males means they're going to be trying to one-up each other for dominance and you want all the girls to have an adequate break. So
Your options are to
- remove one of the males and get 3+ more girls
- remove the girl and keep the two boys
-keep the two boys and get 7+ more girls
If you wind up going one of the add-more-girls routes, you'll want to try to source some girls that are the same age or older, so they've got a fighting chance against your boys, who are essentially about to turn into teenagers experiencing a sex drive for the first time (they're going to behave like monsters) and I'd suggest you get on that ASAP, since it will take a little while to integrate new ducks into your family and ideally you'd like to give everybody a chance to settle in before the feathers start flying. You should also probably stick to mostly or all larger breeds so your big boys dont hurt anybody just by being bigger than them (more pekins, muscovies, appleyards, saxony, etc. dont pick up a dozen little call ducks to get trampled by a couple of giant pekins who are just too heavy for them)