In response to your query,
Indian Succession Act, 1925- “Will” means the legal declaration of the intention of a testator with respect to his property which he desires to be carried into effect after his death.
And when you are making a will on a minor's name it is necessary to appoint a guardian for the child and mention about the same in the will according to the Hindu Minority and Guardianship Act, 1956.
You should advise your friend to make at least a basic Will to cope with his estate and grandchild's guardianship. It is necessary to name a guardian for the child in this Will. Guardians take on a fiduciary role since they are in charge of a child's finances and welfare until he or she reaches the age of 18. A parent is regarded as a minor's natural protector (subject to rules under personal law). However, a guardian may be appointed by the last surviving parent's Will (testamentary guardian), or by a court order in the absence of a Will (appointed by court).