Re: weird Q but
I have had couple of friends living in joint family system here and this is from what I have heard.
Scenario One: There r days that each bahu does the cooking bit.
Scenario 2: they cook their own meals for their own families.One of my friend says that her husband liked different food then what was cooked so that was one of the reason that she had to make diffrent stuff.
Some negative points if not assigned and more unsid rules is that it can end up in nobody taking the responsibility of keeping things in order like pantry stocked up etc. Also in the sharing of the house maid, if she is asked by too many parties to take care of their stuff.More like a tug of war.