Gwok Jing's relationship with his father-in-law East Heretic Wong Yerk See was notoriously tense due to their disparate world views and personalities, but what was Gwok Jing's relationship with his own son-in-law Yeh Lut Chai like? I imagine that it must have been very good considering that Gwok Jing and Yeh Lut Chai were very similar to each other in terms of personal values. Moreover, both served the Mongol Empire during their youth only to join the Sung cause later in life. Even their martial arts sets were similar.