It seems to me, that your sister and husband did not ''make the right moves''..
I think (and Im sorry If Im getting too much in your family matters..) that husband should not quit job, especially this period, the most important for a family with a new member...
I think, this is the period that husband has to be responsible for his family and bring stability to home..
To pursue our dream, is what we all want, tell me one who would not want to... But, the question is: Can we do it, without bring problems to others and especially our family???
Cause, if we want to, we then first should be ok with our responsibilities.. And that is our family, our baby and our home..
I think, that, if we all come to Mikes position, we would all probably do the same thing, as his parents did..
The thing for me, is: Does your sister and brother in law have realised into what problems this situation have brought to families??
And I wonder, why your parents move and leave their house?? Are they tired with this situation? By moving to another city, is this a way, maybe, for them to make the couple become more responsible and take life in their hands finally?
Im sorry, if I write something that does not sound very good to you, I just wanted to express what I got inside, reading your thread..
With all my respect, to you and your family, dear Mike.