Hello Ajay,
Please refer to Section 80C (2) (i), it states as under;
80C. (1) In computing the total income of an assessee, being an individual or a Hindu undivided family, there shall be deducted, in accordance with and subject to the provisions of this section, the whole of the amount paid or deposited in the previous year, being the aggregate of the sums referred to in sub-section (2), as does not exceed one lakh rupees.
(2) The sums referred to in sub-section (1) shall be any sums paid or deposited in the previous year by the assessee—
(i) to effect or to keep in force an insurance on the life of persons specified in sub-section (4);
And Sub Section 4(a) of Section 80C says as follows:
(4) The persons referred to in sub-section (2) shall be the following, namely:—
(a) for the purposes of clauses (i), (v), (x) and (xi) of that sub-section,—
(i) in the case of an individual, the individual, the wife or husband and any child of such individual, and
(ii) in the case of a Hindu undivided family, any member thereof;
Therefore if you are asking for an individual, then the deduction would not be allow in pursunace of Section 80C mentioned as above, however if you are referring an HUF, then the deduction would be allow if, the grandson is a member of HUF.
I hope this reply would be needful for you.
Kind Regards,
Priyanka Kushwaha