Staying in work at this time is short term pain for long term gain. I found working while they were younger has enabled me to get to a more senior role and be more flexible when they are older. Arguably they need you just as much (if not more) when older.
My pension is healthy, my CV has no gaps, I've been able to stay current in a fast moving field where only being as good as your last success matters.
I have financial independence i.e. if our marriage broke down I'd be able to maintain a standard of living. As a couple we have financial resilience 2 incomes means a tiny bit more stability in worrying times.
We're not rich but neither do we struggle. We keep up with tech (second hand) and have holidays abroad every 5 years. We're overpaying our mortgage. Saving for our children and saving into a pension for them.
Our children get to do lots of different things (far more than I did as a child with a SAHM).
We get sick pay, holiday pay, have a death in service benefit all of which I'd lose if I had stopped working.
I enjoy working. My children know what I do now and are really proud of me. I love the challenge and I enjoy meeting other adults.
The short term expense of childcare should be balanced against the long term income of working.
We've spent around £60,000-£70,000 in childcare but are coming to the end of that now. That's over 13 years BTW!