lanzu:=x1 (mass) is a family with members including x2 bonded/tied/joined according to standard x3 

panzi:=x1 is a [biological] offspring/child/kid/hybrid of parent(s) x2; (adjective:) x1 is filial 

speni:=x1 is married to x2; x1 is a spouse of x2 under law/custom/tradition/system/convention x3 

bersa:=x1 is a son of mother/father/parents x2 [not necessarily biological] 
mamta:=x1 is a mother of x2; x1 bears/mothers/acts maternally toward x2; [not necessarily biological] 
patfu:=x1 is a father of x2; x1 begets/sires/acts paternal towards x2; [not necessarily biological] 
tixnu:=x1 is a daughter of mother/father/parents x2; [not necessarily biological] 

bruna:=x1 is brother of/fraternal to x2 by bond/tie/standard/parent(s) x3; [not necess. biological] 
dzena:=x1 is an elder/ancestor of x2 by bond/tie/degree x3; x1's generation precedes x2's parents 
famti:=x1 is an aunt/uncle of x2 by bond/tie x3; x1 is an associated member of x2's parent's generation 
mensi:=x1 is a sister of/sororal to x2 by bond/tie/standard/parent(s) x3; [not necessarily biological] 
tamne:=x1 is cousin to x2 by bond/tie x3; [non-immediate family member, default same generation] 
tunba:=x1 is a sibling of x2 by bond/tie/standard/parent(s) x3