Well, when DH stopped doing shiftwork we weren't parents yet... or even an actual couple (same house, separate bedrooms lol), but it did make things a lot nicer, and definitely improved our relationship. Going from odd hours and long shifts, to a regular 9-5, 5 days a week, meant a much more even split on chores and daily tasks, more time together and less strain on everyone involved because we didn't have to tiptoe around when coming and going because one of us was asleep and the other was awake, kwim?

For us it wasn't a difficult adjustment at all, but again, we didn't have kids and we weren't even together, just best mates living under the same roof, but I don't see it being terribly hard to get used to in a familial situation like yours, kwim? Your DH might need a bit of time to get his head around the change, as we all do when changing careers/jobs, and the kids would probably drive him bananas for a little while as they'd be excited to have 'awake dad' around more often than 'sleeping dad', kwim, but I think once that's sorted it could only be a positive thing. More time to spend with the kids, more time to help you out around the house, more time for the both of you to spend as a couple rather than 'ships passing in the night', and a lot less padding around trying not to disturb anybody while they're resting at odd hours!

I hope you guys make a decision that suits your situation and that it has the best outcome for you Best of luck!