Well, the answer to this is simple, joint family has both pros and cons. But since everybody needs their comfort and privacy, joint families are not seen any more. Also, most people move out of their native places in order to take up jobs and this entails moving out and staying in different cities, owing to which it is difficult to maintain joint family. Nuclear family is what is seen most of the time but now since both parents are working, again people are depending on their parents. Also sometimes parents refuse to move in with the children because they just don't wish to move out of their comfort zone. So we can't say for sure if joint families are good or not because it is better to live peacefully and stay apart rather than have constant bickering by staying together.