HashemLovesMe, I agree. I think this is a product of the “everything is coming to me on a silver platter” mentality which is unfortunately the norm today. And what bothers me more than general support (food, rent etc) is when the children are driving expensive care (two!) and taking vacations all while totty and mommy are working two jobs each. (And then the children move in for as long as they like while the poor younger sister spends Shabbos afternoons changing diapers and cleaning up toys.)
I know someone who has children in high school and is still supporting her husband who is learning. Her kids understand that totty is not bringing home an actual salary, and if it means wearing something a few more times rather than getting something new when they feel like it, its ok. That, IMO, is being Moser Nefesh for Torah. Not being handed everything in a box with a bow on top.
(And yes, if the parents are able and want to do it, then go right ahead. Its just that today, how many people can really do it?)