Nap time placement

[Secondtimearound]

Wow !!! I think I would def not mess with your own sons room , how many rooms do you have ? I would put the two with bad sleep patterns together , break up the siblings and put the 30 month old and 3 yr together ( I think )
I use three rooms and with the doors shut , I use the hallway with a camping cot as well . It makes like a private area . I use noise machines and fans and have gotten better with letting them cry . Eventually they get used to it,

[Fun&care]

Also, a lot of your kids sleep in "intervals" just wanted to throw it out there that I find kids get worse if I actually go in and tell them to go back to sleep. So make sure you do NOT go back in and make contact lol. It sounds funny but really it's true. Of course you can check on them just make sure they don't see you.