Chandra From Anantapur want legal help in Property / Ancestral Property / Will

A person named 1(father) Write his property shares each half to A( son of a elder wife)and B( younger wife)through family settlement deed, A deceased interstate without marry and being not registered his property in the records of govt. but, given an agreement to C(neise to A)person without consent of B. Does it becomes valid? If not whom that property belongs to?

Shall a grand daughter have rights on the grand father property being not having proper heirarchy details. as the mother of grand daughter legally not registered her name in the government records.