外甥孫婿 [－－孙－]

Jyutping ngoi6 sang1 syun1 sai3
Pinyin wài shēng sūn xù

Definitions (Wiktionary)
  1. noun, Min-Dong
    grandson-in-law (daughter's son-in-law)
    (syn.) 外孙女婿, 外孫女婿