x1 is a genetic-familial/'blood' ancestor of x2 by bond/tie/relation/of degree x3.
x2 must be the genetic offspring of x1 or the genetic offspring of someone who is also a ginlazyseldze of x1; trivially, one may consider x1 to be a ginlazydze of themself (x1), and possibly/probably others. See also: kraune, kloje, tseingu, dzena. This is more specific than seldze (x3 is much narrower). This word is equivalent to "se ginlazyseldze". This word allows familial peers as possibilities for x1 and x2, so this relationship is a subtype of ginydze.