A word in the Gnomish Lexicon of the 1910s glossed “consanguinity”, an abstract noun formation from †hest “brother or sister” with variants hestri and hethri (GL/49). It also had variants G. gochestri and gochethri with the prefix G. go- “together” (GL/40).
Gnomish
gochest
noun. brother and brother, brother and sister, etc.
gochestri
noun. consanguinity
gwachest
noun. brother and brother, brother and sister, etc.
gochethri
noun. consanguinity
hestri
noun. consanguinity
hethri
noun. consanguinity
A word appearing as G. gochest in the Gnomish Lexicon of the 1910s as a collective term for a pair (or set?) of siblings, a combination of G. go- “together” and hest “brother or sister” (GL/40, 49). It has a variant and “more correct” form gwachest (GL/43).
Neo-Sindarin: For purposes of Neo-Sindarin, I would retain the word ᴺS. gochest based on the word ᴺS. hest “sibling”.