In the novel 'Game of Thrones, which family holds the real power?

In the novel Game of Thrones, all the families were fighting for real power, but no family was the absolute ruler. The power game was a complicated political game. The relationships and interests between families were constantly entangled. Each family had its own supporters and opponents. As the game continued, the power and status of the family would also change continuously. In the novel, some families had great power and wealth, such as the Noble House and various powerful families in Westeros, but these families were often threatened and challenged by other families. The entire game of thrones was full of drama and conflict, making it difficult to predict the future changes.