He broke his vows right here, if you ask me. No one owes anything to an oathbreaker.

He vowed to love, honor, and respect or cherish her all the days of their lives if they took the standard common vow.

Did he leave his love for her under a rock when he unilaterally upturned her life without her consent or consultation?

Did his honor for her get left at the dry cleaners when he casually disregarded the fact that she made clear she doesn't want more children?

It's as clear as day his respect for her for run down like a dog on the highway. That doesn't even need to be said. But how do you reckon he thinks he's cherishing her when he is not lovingly protecting her needs which she has made very clear.

It's good that he wants to take in his sister's children. He's well within his rights to do so and he has a duty to his family, as do we all.

But.

The fact is he's got to make a choice. His duty to his family is at cross purposes to the vows he made. That's not his fault. That's not her fault. That's just what is.

So they both have to make a hard choice and then live with it.