Wow!! Working to earn a living to provide for your family is considered being a mule?? 
I think the title of the thread is inappropriate… the questions asked within the thread are not 
PCG… to be very honest, I wouldn’t have married a guy still studying for a degree, I got married at the age of 28. Both of us work and so if one decided to pursue a higher degree now, it will easily work out as we will have at least one source of income. (In fact I’ve been pushing my husband to go get an MBA, but he’s not interested.)
Otherwise (if only he was working), there are too many responsibilities on my husband’s shoulders (including his parents’) to just up and leave his work and go study for whatever reasons… no responsible adult would do that. But if we could scrape by while he was studying, it would also be fine then. It all depends on whether we could survive and fulfill our family’s basic needs on that income or not.