Where I am from, sisters are not allowed to handle their own territory cards if there is a man in the car.
You must hand the territory card to the brother and let him direct everything. You are not to tell him which streets have already been worked or give him any kind of clue as to the best way to proceed.
You must do this even if the brother is a moron when it comes to map-reading.
Result? If you are a moron map-reading brother, you will get into a car full of sisters and no one will have any territory cards........
One time, this moron of a brother sent two sisters to not-at-homes that had just been done 10 mins prior by a different set of sisters. No one was allowed to tell him of this blunder (it would appear the sisters were not submitting to his headship.......sheesh.....) So the houses that were not at home 10 minutes ago,.......were still not at home.
Idiots.