That maybe true... traditionally and logically, sons have been the ones taking care of the parents.
If I had to, would I take care of my wife's parents? Of course but if they have a son, I would be hesitant to offer any help because from their son's point of view, I would be looking for same attitude.
Your generational seed is carried forward by SONS, not daughters. Daughters are married off and sent to another home... if parents choose to live with their daughter then thats their choice but that may not settle well with daughter's husband.
There is no cookie cutter solution to this problem, it all depends on your means, how many sons and daughters you have and what is their position as far as take care of elderly parents is concerned. It's not like you will be in pristine position and ready for your parents in law or parents, people will have to make some changes in lifestyle, cut spending and make room for new members of the family. So, there are many factors that need to be considered before taking on this huge responsiblity.
Still, they are within my reach. Wife nahi cook karey ghi tou kya wife ki maan aah ke cook karey ghi? Of course, the wife will have to cook and take care of them when I am not there along with their grand children.
Even if at BIL, that is still a third person, a paraya home if you will... parents generally don't consider their son's home as paraya but their daughters, yes because she is married into ANOTHER family.
If I look at it from your POV....either way it is a third party that will take care of the parents.
Times have changed JL....people have changed due to this change...the roles of daughters have changed as well. People are begining to accept the fact that it is OK for a daughter to take care of her parents as well.
Ideal situation....parents should pick who they want to live with (if they want to live with anyone) and the spouse of that son/daughter should be accepting of it. If only we lived in an ideal world!
If and when I get married.....I plan on taking care of both my mother and my in-laws when they are no longer able to care for themselves even if it means having them both live with me. :D