Que so las reglas que le dieron al señor dussel?

From the text:

Dussel is terribly lax when it comes to obeying the rules of the house. Not only does he write letters to his Charlotte, he's also carrying on a chatty correspondence with various other people. Margot, the Annex's Dutch teacher, has been correcting these letters for him. Father has forbidden him to keep up the practice and Margot has stopped correcting the letters, but I think it won't be long before he starts up again.