Question Summary:
Bequeathing one third for daughter in law.

Question Detail:

 
CAN A PERSON WILL HIS 33% OF ENTIRE PROPERTY IN THE NAME OF THE WIFE OF HIS ONE OF THE SONS.

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
A bequest of one third may be made only after burial expenses and paying of debts. Accordingly, it is not permissible to bequeath 33 % of the entire property before burial expenses and before paying the debts.
It is permissible to make a bequest for a daughter in laws as she is not an heir. . [1] [2] [3] [4]. [5] [6] [7]  
However you indicate that you have other sons and daughters in law. We advise you to consider the negative consequences of making a bequest in favour of one daughter in law to the exclusion of others. Undue favouritism could lead to animosity and disunity.
And Allah Ta’āla Knows Best
Imran Cyclewala.
 
Student Darul Iftaa
Lusaka, Zambia. 
Checked and Approved by,
Mufti Ebrahim Desai.