What is the ruling on changing the names of the father and grandfather in official documents to belong to another tribe in order to obtain civil rights, while not denying the original name, and what should the children do in this regard?

A man is not permitted to ascribe himself to other than his father or his tribe, unless compelled to do so in official documents to avert a real harm or an unbearable hardship that prevents him from fundamental rights, provided that this does not entail nullifying a right or validating falsehood. The official name must be corrected whenever possible.