We have 2 DC, 6 and 4.
DH always does DD, 6, bedtime and I always do DS, 4, bedtime.
It works well. If one of us is out we do their stories together.
They both have a few chapters of a chapter book read to them. We as parents quite like to follow the story too but I feel it's a shame to miss out on one child and for them to miss out on a parent.
Or does it not matter and we should just enjoy a routine that works with the knowledge that the children get a lovely story from one of us.