ᴺS. [G.] sion n. “grandson” (Category: Grandson)
A noun appearing as G. sion “grandson” in the Gnomish Lexicon of the 1910s (GL/67), probably related to ᴱQ. yó or yond- “son” in the Qenya Lexicon (QL/106), though where the initial s came from is unclear.
References ✧ GL/49, 67