Regarding Jing's grandma, @Kali_01: right, I think she doesn't know abt FFYY and Hou affair and only knew that she trained her to be the Tushan clan leader's wife so she didn't want to waste years training another one (XY) -feel free to correct me if I remember thing here right or not, hahaha
And yes during the coma years of Jing, for that 37 long years, I think they've exhausted almost all their resources to keep him alive and his grandma wasn't already in good condition, right?
Jing's grandma has good points but also the bad ones that led to Jing's suffering later on and Hou's changed behavior, esp him wanting to desperately win over Jing and prove him that he was better...