greatgrandparent

In practice, marriages are held to be valid between persons fourth in descent from a common ancestor in the case of male relationship, and third in the case of female relationship, that is, persons having a common greatgrandparent in the male line or a common grandparent in the female line can marry.

The Tribes and Castes of the Central Provinces of India Volume II R. V. Russell

The Chhatris avoid marriage between relations having a common greatgrandparent, but among the Bhamtis the custom of

The Tribes and Castes of the Central Provinces of India Volume II R. V. Russell