I have 3 children. Two girls , 5 1/2, 3 1/2 and 1 boy who is 2. I have just dropped the afternoon nap for my boy. I find that getting them all ready for bed at 6.30, into bed at 7, and stories all together in one room works (normally the girls room so they don't have to get out of bed again). I play a background 'baby relaxing sleep CD' at the start of story time on the landing. It calms them all down subconciously whilst I read. I then settle the girls who are out like a light because of the tape. Then I settle my little boy, who is ususally more difficult to calm down. I sit beside his bed, no eye contact and say goodnight. I give hime 5 mins and then leave, saying I will pop back later and that I have jobs to do. He will normally settle himself. If he does get out of bed, I return him with little chat and eye contact. Kiss goodnight and leave.
As your kids are in the same room, I would encourage same time bedtime, as they are still young. Later reward the older child, that if he is quite whilst the other two settle, he can read for an extra 10 minutes.

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