Being on the side of the sick spouse is another option.
But I defy anyone arguing the decision to say “Fuck that noise” and choosing the side of the children.
Does this pertain to a specific family? Yes. Does it have to? No. This is universal.
I have been that sick parent and while at the time I may have been feeling “everyone is against me,” as a well adult I can see that if they were, it was to be for my children. As I improved and recovered, their team merged into being my team as well.
The hardest part of being the well adult in such a relationship, is understanding that making decisions that the sick adult might not appreciate up front, really is better for all involved in the long run. For one of two things will happen: the sick adult may truly seek help and improve and then learn to appreciate what you did, or the sick adult may live out their lives feeling everyone is against them and continue to make poor choices. And while this may be hard to hear, should the second possibility be what goes down, seeing them struggle will be hard but it is best for those who don’t deserve the brunt of their poor decisions. Like, again, children.
When you love someone, watching them make poor choice after poor choice is hard. Making a choice that will inconvenience them can be harder. What needs to be remembered is that it’s the inconveniences in life that push us to fight harder and overcome our obstacles towards self improvement, even in the best of circumstances.
And in parting, it is very easy to promise “never again” from the comfort of consequences already being revoked. Knowing, or thinking you know, that you’ll always have the convenience of someone struggling against a tough decision. The promise of “never again” made with the grantee that things won’t be convenient again until after they’ve proven and lived up to their promise, is a while new promise in of itself.