Right now our oldest is 2 and goes to bed first, usually tucked in for the night by 6:45 PM. Our 3 month old's schedule is still pretty up in the air, but she generally goes to sleep a bit later in the evening.
Though the staggered bedtimes allows us to focus on one child at a time, I'm looking forward to the day that we can give them a bath together, all read some stories, and then tuck them both in for the night.
What does your bedtime routine look like with 2+ kids? If you do their bedtimes together how old were they when you started?