Standard Si Sok Your teacher’s Si-Dai; Kung Fu Brother of SiFu Traditional Writing: 師叔 http://wingchunlexicon.com/wp-content/uploads/2017/01/SI1-SUK1-_mdash-Wing-Chun-Elements_-Glossary.mp3
Standard Si Sok Gung Kung Fu Brother of Si Gung Traditional Writing: 師叔公 http://wingchunlexicon.com/wp-content/uploads/2017/01/SI1-SUK1-GUNG1-_mdash-Wing-Chun-Elements_-Glossary.mp3