So, the two roosters are older chickens? I’m a little confused. If you have one pullet in with 3 cockerels, I would separate her ASAP, or make plans to do so sooner rather than later. If those boys hit sexual maturity before you get rid of them, she will have no peace. They will knock each other off her to breed with her, they will chase her relentlessly to breed her, they will chase her from food and water to breed her… At least that’s what happened here when I had a 1:1 ratio of cockerels to pullets. Those girls had no peace, and there were a dozen of them.