x1 is the (x2 + 1)-оюродный (li; integer) kin member/relative of x4 defined from base relation x3 (si'o; generic term, applied with respect to x4) in directed, connected tree graph/network/hierarchy x5.
This word generalizes the concept of the adjective sequence «двоюродный», «троюродный», etc. in Russian; there is no good, simple term which describes this transformation in English; the basic idea is that x1 is a relative of x4 according to x5 who is in the same generation as the base relationship given by x3 but who is x2 degrees greater in separation from x4 than a person who is x4's x3 would be (should they exist). x3 is a "si'o"-abstraction with the embedded selbri being a relationship (herein denoted as "R"), such as "sibling" or "grandparent", between a generic pair of nodes in such a tree graph; it is understood to be with respect to x4. Extract and define ξ = tamseingu2 and υ = tamseingu3 for R relative to its relevant primary subject node (so, if R is "being a sibling (of x4)", then (ξ, υ) = (1, 0)). Notice that ξ is a nonnegative integer. Then x2 must be an integer such that -ξ ≤ x2. The result of asserting this word is that "x1 tamseingu (li ξ + x2, li υ, x4, x5)" is being asserted to be true. Gendering, ages, etc. or comparisons thereof in the embedded selbri (R) of x3 does not have any implication for the same properties of/concerning x1. The actual existence of someone who satisfies R for x4 is not implied. This word need not apply solely to familial relationships; for example, it can apply to those of a corporate organization chart too (see: "grafnseljimcnkipliiu"). See also: "tamne".