1) as per will property is gifted to your mother and father and unborn children
2) Transfer to unborn persons is invalid.
Where a bequest is made to a person by a particular description, and there is no person in existence at the testator's death who answers that description, the bequest is void. S.113 of Indian Succession Act, 1925 provides that for a transfer to an unborn person, a prior interest for life has to be created in another person and the bequest must comprise of whole of the remaining interest of the testator.
3) your mother is not absolute owner of property as your father had equal share in property