we have a 3 year old in with her 5 year old sister. they go to bed at the same time. sometimes the 3 year old will go to sleep first and i will let the 5 year old stay up. she will go lay with her little sis until she falls asleep and then come out to the lounge room later. occasionally my 5 year old will fall asleep first and her little sis will crack up a bit and say she cant sleep and cry but she doesnt really wake her older sis up. it has happened a couple times and i just get them to lay in the same bed together and that usually works. this usually happens if my youngest has had a nap during the day.

could you hold off on your DS day sleep? or wake him up extra early so that he goes to bed earlier?
I have tried not to let him sleep but if he does to bed before 7pm (even with out a day nap) he is up at 5am

DD crys because Ds is making too much noise at bed time

i keep thinking i should just sleep in ds's bed with my daughter and DH can sleep with DS