A. As per the law of succession in respect of Christian, If the deceased is a Christian Where lineal descendant is present:
Widow / widower – 1/3 of the property
Lineal descendants – equally to share 2/3.
In the absence of lineal descendant, to all grand children, equally In the absence of grandchildren, to great grant children equally Lineal descendant of a predeceased child or lineal descendant of a predeceased child of a predeceased child if
present - division is based on equal shares, taking the predeceased child to be alive, and a downward distribution among the lineal descendants. In the absence of lineal descendant: Widow /widower – 1/3, Father – balance entire, If Father is dead, to mother, to mother, sisters and brothers- equally If father is dead, to mother, living sisters and brothers, and children of a predeceased sister or brother- equally so that one share to be taken for the predeceased sister or brother to pass through the lineal descendant to such predeceased.
B. You would do better approach the court to file Partition Suit and it must be adjudicated by the court because of ample claims over the property or try to resolve the matter by amicable. Contact a local lawyer to know the clear guidance.