I fully expect to care for my mother when she's too old to be independent.
Sorry this didn't come out properly but I quoted the above from the OP.
OP - I find your post interesting. I think the thing that stood out first to me was your comment above. You will take care of your own mother, but want nothing to do with your MIL in her old age.
I read your entire post so I understand your concerns there. But you comment about problems when inlaws become a burden in old age, without being concerned with the 'burden' your own mother might cause to your wife.
I have to say I take some objection to some of your comments about people being complete mess's on here and comments you make such as "I also see a lot of older parents who just don't seem to be all that intelligent". Not very nice to a group you are hoping to be a 'souding board' for.
"The fact that so few moms come on these pages to express their regret for all the stupid, hateful, abusive things they did to their own children, and for the horrible choices they made, particularly in their choice of husbands, really seems to underline that kids who grow up hating their parents -- or simply becoming indifferent to them -- are justified in their feelings."
This comment makes no logical sense to me - how does one thing follow the other? Few moms coming on this page = angry kids are totally justified?