K.J.
I have three, ages 4, 2, and 3 months, and this is what we've been doing that seems to work well for us.
Eat at 5:30/6
Baths immediately following - I put the baby in a bouncy chair in the bathroom and feed him a bottle while i bathe the older 2
Put the older kids in pj's and let them play in their bedrooms while I bathe the baby
Swaddle the baby and put him in his swing or sway him to sleep and put him in his bassinett around 6:30/7.
I do all baths in the evening because I think they really are soothing ways to end the day.
After I put the baby to bed I do books and teeth brushing with the older kids and put them to bed. The older kids are usually in bed right around 7:30.