It is believed that the deceased was Hindu and Hindu Succession laws shall apply.
If the lady has not given away the property in her life time by WILL, Gift/sale/relinquishment/Transfer/ Release deed etc then;
1. If the property was self acquired by the Lady:
The property shall firstly devolve upon the sons and daughters (including the children of any pre-deceased son or daughter) and the husband
2. If the Lady had acquired property from his Father or Mother, in that case the first right will be of the heirs of her father and not husband, in case of absence of his sons or daughters
3. If the Lady had acquired any property from her Husband, in that case the first right will be of the heirs of her husband , in case of absence of his sons or daughters
Thus all ClassI legal heir can relinquish their rights in your favor.