though I have the greatest sympathy for you the difference is that it is your husband not hers who is ill. That it should inconvenience your life is to be expected, he is your husband. For her exs illness to inconvenience her is another thing entirely
We are looking at this from entirely different view points.
I appreciate it's my husband who's ill, which is why I don't expect his ex to be the one going to the hospital to make sure he has what he needs every day/discussing his care with his doctors and so on.
But regardless of their relationship status, she still shares children with him. He is still HER children's father. That is a choice she made (as did he), both knowing that if the other died, became ill, skipped off into the sunset then it would be on the other to take care of the children.
It doesn't change just because I married him, it's about the children not him. If I didn't exist would you expect her to let them go into foster care for the week or would it suddenly then be her responsibility to take them?
Such an odd odd way of viewing parenting.
As I have said repeatedly if the situation were reversed (and it has been in the past), I absolutely would expect my husband to take the children. Not because he is in a relationship with his ex, but because it's about HIS children.
And I know damn well if it were her in hospital starting a thread saying my children's dad won't have the children extra whilst I'm laid up in hospital he'd be ripped a new one by posters her as a shit father ducking on his responsibilities.
It's absolutely nothing to do with whether they are together or not. They aren't, but the fact is they share children and always will that they are jointly responsible for, not anyone else.