The only idea i could give you would be to make sure you get him down like 30 minutes before the others, hopefully he could do his "scream" before they are ready to go down for nap? Other than that...I guess you just tough it out as long as you can, I would give it like maybe 3 weeks tops, I guess I would have to use my "breaking point meter" and not take him a minute longer, just depends with all kids, some cry louder, some just have a way to rub you the wrong way, and some just whine and you can put up with it longer. use your best judgement, but know your limits. thats a tough one. Nap time is VERY important to all children and for our sanity for sure! hope it gets better.