On an ideal day Brody will go down about 8 and Mason a little after.
It doesn't always work and Mason has to go to bed first, which I try not to do so he can have a story or something with us before bed.
When Brody was a lot younger I'd try and keep him awake later, like 10-11pm as he would be waking up all night and I wanted him to sleep more.
It didn't help at all though and if anything he slept better when he went to bed earlier.