...how old are they?
My eldest is nearly 4 and we still stay with her until she's asleep. We've had a consistent routine since she was tiny and generally speaking she's asleep within 10 mins after the last story, but we have to sit next to her and either hold her hand or just be there. She goes through phases of waking up at night - and is calmly walked back to bed with another hand hold - but at the moment is sleeping through.
I don't mind sitting with her generally speaking - it's a nice time to connect. But she seems to have an anxiety about us leaving and it can be hard when doing solo bedtime if younger child isn't settling easily (also going through a stage of wanting to be cuddled to sleep).
Any tips if you've been there done that/still doing it?