DS is 13 months, DD is 4.
DD goes to bed at around 7pm ish.
DS since a baby has taken a long time to get settled, often not settling til 8-9pm so would go to bed after DD, although we would do bedtime routine together. I have brought his sleep back, and we aim to get them both in bed for 7pm, but it never happens, DS always settles at around 7:30pm, often as late at 8pm. Even if he is in ed for 7pm it takes a while. And DD often wants me to put her to bed (DS is breastfed). I would love DS to be in bed before DD as this seems the 'correct' way.
I wondered what your routine is so i can copy you and how normal it is for younger ones to go to bed later than older ones.