ginlazdze lujvo

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.

In notes:

ginlazyseldze
x1 is a genetic-familial/'blood' descendant of x2 by bond/tie/relation/of degree x3.
ginlazytamne
x1 is genetic-familial/'blood' cousin to x2 by bond/tie x3; [non-immediate family member, default same generation (zero-times removed)].
ginydze
x1 is a genetic/biological ancestor (or familial peer thereof) of x2 by relationship/to degree x3 through/along graph-geodesic within their shared biological family.
rirny'utka
x1 raises/is a mentor to someone who raises/is a mentor to someone who raises/is a mentor to [...] to someone who raises/is a mentor to x2 via intermediate steps x3 (ce'o).