Please check the link Vishnuji.............as per advocate R. Ramachandran mother is also entitled in deceased son's self earned property, copy & paste of his statement is as below...............
" Dear Mr. Ravi,
First accept my salutations to you for your noble thought and concern for the elderly mother.
Be rest assured that while she has a right in the ancestral property (of which you seem to be cock sure), she also has a right in the property left by her son (even if her son had not left any WILL).
This is because, as per Hindu Succession Act, 1956, she is a class-I her, as indicated below:
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.
Thus, she will definitely get a share in the properties owned by her pre-deceased son. Approach the Revenue Authorities and obtain necessary heir certificate and proceed to stake a claim of her share.
All the Bests. Good Luck.