Agree. No offense but you are a bit controlling of your brother. This is really none of your business. It's his telephone and she is his friend. In some families, it's rude not to pick up a phone (any phone) when it is ringing; but in other families, it's considered rude if it's not yours. If you're really upset, you may talk to your brother AS IF HE IS AN ADULT, but you can't preach his friend.