Today's world is engulge in there own themes own ways , people don't have the time for others.
Mostly people are isolated , like you don't even know who is living next to you?
Actually, We become accustomed of engaging in our work only and this type of mentality is been promoted by nuclear families .
Joint families act as a preservor for this , they make us understand the society and help to cope up with others.

There are many benefits of the joint families.
In a joint family you can't be alone anytime and anywhere you will be accompanied .
You will no longer have a strong desire to be alone.
There will be someone for you.
It is the best pattern of living that is most conducive to the growth.It is based on a principle of equitable economy. It holds it as a rule of creation that all men are not equal. Naturally it imposes a kind of unwritten discipline that those who are more able economically shall share some of the burden of those who are not.
Economically seen it most valuable way to live happy together.

You can give time to your older ones , can take care of them.
This system is based on the requirement and neccesity of each other.
Everybody cares for each other , when there is lovely bonding between people , the place seem to be no less to heaven .
And it is a system basically give and take. when you take care of everyone , and nothing in subtle in joint family .
And your morality and the customs will not splinter , they will be prolonged in the mind of each and every generation.