I do hope she's joking.
Spoiler alert for anyone who has not picked up that lots of people die in the "Song of Ice and Fire" books and the "Game of the Thrones" TV programme based on it.
Learning about the facts of life from that programme might be the way to imagine that it's OK to
- cheat on your husband with your own brother
- cripple any small children who might be in a position to give you away by throwing them from the top of a tower,
- kill your mistress when you find out she's been spying on you for your dad, and
- kill all the guests at your daughter's wedding