turnersei lujvo

x1 is a descendant of x2, x3 levels down from it, in hierarchy x4

Distributive across all four arguments. See stura, nenri, grafu, tcana, dzena, turne'i, turnela, tursei, turtuba. No in-language definition for now because of uncertainty about grafu's definition.

In notes:

x1 is a descendant of x2 in hierarchy x3
x1 is x3 (undirected) hops away from x2 in graph x4
x1 is a child of x2 (one level below it) in hierarchy x3
x1 and x2 share common parent x3 in hierarchy x4