This granny is worst than a weathercock... She change side every chapters and is only interested by who or what will give her the most expensive rewards...
Both are trash... Though to be fair, everyone in this family is trash aside from the third sister and her mother (and possibly the fourth sister's mother who seems more stupid than evil (while her daughter is both stupid AND evil ^^)).
Well nobles, they base their relationships on what benefits they bring with. It doesnt surprise me that the older they get the more selfish they are and it is also no wonder how spoilt rotten their children are