I have two employers, 5 years of overseas military deployments, 2 kids that are nearly grown, a young foster child with ADHD and extreme attachment disorder, and side code projects. If both spouses want to make it work you will figure it out.
I am not an outlier. My current army brigade commander is a Colonel with grown kids and military deployments plus a PhD with prior employment as a school system superintendent.
I read a quote here a few months ago: you can do a good job on two of kids, relationship, job.
You need to loosen your expectations towards yourself a bit and choose your battles. See the parallel article here [0]. Don't grief if you can't get the balance right all the time, just keep trying.
The most important aspect I found is to keep connected and giving to your spouse. The two of you have chosen that live and are in it together. Keep giving and you will get back, there can be a lot of strength in a relationship.
Your relationships on the other hand, will hopefully last a lifetime.
Act accordingly.
Edit: A practical advice – I haven’t worked a 40 hour week since I became a dad. Well worth the pay cut.