It’s hard overthinker, not something we plan for that’s certain. Our son and his wife split up seven years ago. As her Mum was geographically distant we supported them both initially and also our grandchildren. Hard? Definitely but oh so worth it.
We’ve kept a good relationship with our former daughter in law who is now happily settled with a new partner. It was hard, I’ll not pretend otherwise, but so worth it to have kept that link with the mother of our much loved grandchildren. Please try not to take sides. We supported our son while never, ever being sucked into criticising his wife in conversation with him. Their relationship is fairly amicable now, we’ve relaxed and now and again will agree with our son when he makes what seem to us to be accurate comments about how things were.
In our case yes, it has got better. The shock passed, divorce happened, our grandchildren matured and have coped wonderfully well. Our son talks to us openly as does our former daughter in law. They can now be in the same place to celebrate family milestones. Has it been easy for anyone? Nope. Mr C says he still bears the scars on his read from sitting on the fence. We got through it, as will you in time. Wishing you well.