輩數 [辈数]

Jyutping bui3 sou3
Pinyin bèi shù

Definitions (Wiktionary)
  1. noun
    seniority among generations in a family or clan; position in the family hierarchy
    (syn.) 輩行, 行辈, 行輩, 字勻, 字辈, 辈行, 字匀, 班辈, 字輩, 輩分, 班輩, 辈分