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

Why does all this happen?
Simply because you (parents of the groom) have forced your 
son to live with you, in opposition to the dictates of the Shariah. 
Or because you have prevented them from living separately in 
the hope of saving some money by all living together. 
Third harm
Another great harm in allowing your married son to live with 
you is when you have smaller sons in the home, who are not yet 
married. The Hadith Shareef explicitly prohibits contact 
between sisters-in-law and brothers-in-law. In fact the Hadith 
says that a woman’s brothers-in-law are death. This severe 
warning from Nabi (sallallahu alayhi wasallam) is ignored 

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daily. They will live a much more peaceful and productive life 
in this way. 
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.