One room?

Tonight, Miss T (18 months) declared she wanted to sleep in the same room as N (5) and K (2.75). So far, it's been an hour and no one is asleep yet, but they are all in the same room. Everytime I think I should go get Miss T and put her in her own room, she refuses to let me pick her up from the crib in their room. I'm letting them have until 10:30 to fall asleep and then T goes to her room. 29 minutes to go.