Section 164 attracted when shares of beneficiaries are unknown

Section 164 gets attracted only when the shares of the beneficiaries are unknown, which is manifest from the marginal heading of that section itself; so long as the trust deed gives the details of the beneficiaries and the description of the person who is to be benefited, the beneficiaries cannot be said to be uncertain, merely because wife/children cannot be known until the marriage and begetting of children by the stated beneficiaries. 

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