mediate and immediate descents

A descent may be said to be mediate or immediate, in regard to the mediate or immediate descent of the estate or right; or it may be said to be mediate or immediate, in regard to the mediateness or immediateness of the pedigree, or degrees of consanguinity. Thus, a descent from the grandfather, who dies in possession, to the grandchild (the father being then dead), or from the uncle to the nephew (the brother being dead), is in the former sense in law an immediate descent... On the other hand, with reference to the line of pedigree or consanguinity, a descent is often said to be immediate, when the ancestor, from whom the party derives his blood, is immediate, and without any intervening link or degrees, and mediate when the kindred is derived from him mediante altero, another ancestor intervening between them.