x1 is a non-binary offspring/child of parent(s) x2 [not necessarily biological]; x1 is filial (but not a son or daughter).
See discussion associated with "dinti" concerning whether this meaning is restricted to "affirmatively nonbinary" or whether it is more general. Umbrella term for any non-male, non-female (in some aspect/consideration/standard) child/offspring. Specifies "selrirni", "verba", "panzi" so as to be co-equal with "bersa" and "tixnu". See also: "verba", "nanla", "nixli", "nakni", "fetsi", "dinti", "vepre", "nunmu", "patfu", "mamta", "rirni", "preri", "bruna", "mensi", "tunba", "pentu", "rorci", "panzi", "bersa", "tixnu".