just imagine the same thing happen in your parents family and your brother's wife in your place want to get separate living from your parents and live with your brother, same case happen in your parents family.. what will you do? just think like that..
in every family a little good, a little bad, a little happiness and a little sad will be there but, in life when you experience everything, you'll know.. life sweetness and pleasureful moments.
remember, living in a joint family is strength and when you got out of it into small family. the respect you get from neighbours, relatives and society will get decreases and totally, your family reputation will be spoiled. life is ment to be adjustments too and enjoy the living in a joint family.
when people are getting old they will act extra-caring and out of it, they create troubles and problems to everyone.. infact some people's mind also don't work properly as they loose memory power, eye sight, hearing, walking and many other problems. so, please try to analyse everything and take a decision.
If you have any more problems feel free to contact me, princeavin@yahoo.com