2nd wife's right on the property after the death of 1st wife

release deed relates to ancestoral property so it is diffrent from gift n wills.from ur case it seems u r owner of self and ancestoral property.as regard property in which u r legatee u r safe.but as regard ancetoral property i must say ur father also has a share in that property and that share may or may not be claimed by ur cusins and i reserve my opinion.stay on for better reply..

If the property is self acquired property of your father and mother, you are entittle to get equal share in your mother's property.

And release deed executed by your father in favour of you holds valid provided if the property is self acquired property of your father, otherwise your 2nd mother will be enttittle for the sahre if you filed a suit for partition against your father.  Wife cannot file a suit for partition independently during the life time of the husband.

mr sumit u r master of ur property..sleep well