x1 is patrilineal/agnatic to/an agnate of x2; x1 is path-connected to x2 via the fatherhood relation, connected by a graph-path passing through intermediate relations/steps (successive agnates) x3 (ce'o; ordered list).
x1 is a father of the father of the father ... of the father of x2. This word is a zi'evla lujvo (brapagjvo) of ".utka".