Dear Sir,
Your doubt is correct. The deceased was having 50 share as he was joint owner with his father. After his death his wife and minor child inherits jointly as such the mother must sign on herself and also on behalf of her minor child as natural guardian. Even then there must be a mention that property was sold for the benefit of minor and account must be given and even strictly speaking court permission is necessary to sell the minor’s property. Please see the following rule of law.
---------------------------------------------------------------------------------------------------------------------------
Section 8 of Hindu Succession Act the wife is entitled as follows:
====================================================================
General rules of succession in the case of males.―The property of a male Hindu dying intestate
shall devolve according to the provisions of this Chapter:―
(a) firstly, upon the heirs, being the relatives specified in class I of the Schedule;
CLASS I
Son; daughter; widow; mother; son of a pre-deceased son; daughter of a pre-deceased son; son of a pre-deceased daughter; daughter of a pre-deceased daughter; widow of a pre-deceased son; son of a pre-deceased son of a pre-deceased son; daughter of a pre-deceased son of a pre-deceased son; widow of a pre-deceased son of a pre-deceased son.