All praise is due only to Allaah. We laud Him and beseech His

As far as possible never keep two daughters-in-law together
If you understand there to be some benefit in having your son 
live with you, then as far as possible never keep two married 
sons together where their wives have to share the same kitchen. 
As far as possible let them all live separately. If this is not 
possible or affordable, then at least keep only one son with you 
and find a separate place for the other. 
An excellent method of avoiding much strife and problems in 
the home is not to have few families living under one roof, 
because to have a few women live in the same home is a sure 
recipe for problems.
[Malfoothaat Ashrafiyya, page 27] 
To keep many women in the same home will cause many 
problems for all concerned. For example, if on the one day the 
one daughter-in-law cooked the food and it was tasty and then 
when the other one cooks she will be under pressure to 
compare and better the other one. If not she will feel disgraced 
and inadequate. So much of grief and misery will be caused in 
that home. There will jot be any peace and contentment.
If the daughters-in-law get along well, then the mother-in-law 
will always feel they are plotting against her. 
Like this there are many other possible scenarios which will 
render such a home a pit of hell for all concerned. 
Not to mention the problems that will arise when the children 
come.
Is this better…?
If in one large house or flat, four (married) brothers live 
together and eat from the same pot, but their hearts are full of 
malice and hatred for one another. Each one indulges in 
backbiting the other and their wives and children are constantly 
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at loggerheads. Is this better or if each one of the brothers live 
separately with their wives and children, but there is respect, 
honour, love and affection in each one’s heart for the other? 
One needs just to look around and it is obvious that nowadays, 
the daughters-in-law do not regard the mother-in-law as their 
mother, neither does the mother-in-law regard her daughters-in-
law as her daughters. In this situation it is difficult for them to 
live amicably together. 
In such homes, where they all live together there is so much of 
mistrust, misunderstandings and ill-feelings. 
We can fill pages and pages with examples of problems that 
can and do arise when the entire families all live together. 
Another harm
Another harm which is the consequence of living together is 
that because of the constant strife and tension in the home, the 
poor wife is beset with constant grief and stress. This naturally 
will impact negatively on her health. She will then begin to 
suffer from all sorts of ailments, such that she will not be able 
to be of proper service to her own children when they need her.