She hasn't even been there long, and some of the family is hating that she is there. They have to realize that she never asked for any of this. If they don't like the treatment she is getting, then they need to tell grandfather. Which they would never do.
So why have we never heard about the sister before now? Where is she? Also Ji Li should have an inheritance that could help her and her talent and situation could have earned a scholarship the family members should be careful before accusing him and her of taking from the family