The sad story is that they "were going to have the full set and didn't plan to have any more children after that." These people arbitrarily considered four children to be the number they needed to be fulfilled and insisted on conceiving them themselves, instead of adopting. Hundreds of thousands of orphans and they decide they can only raise their own genetic material, not once but four times--to be sure they have a "full set". Why save a suffering kid when you can make a brand new one to suck up more of earth's and society's resources solely in service of your ego?
For the privilege of the latter, the woman happily died, leaving the rest of her family with this so-called tragedy. I guess the world is better off without her stupidity. Hopefully her husband will not pass it on to the kids.