You don't. A girl is a girl, not a boy. You need to treat her like one. If she wants to be treated another way, she'll let you know.
Treat her like a lady.
You treat them as you yourself would like to be treated.
Treat them with respect like a parent pretty much. Don't bother them or they will get angrier than they used to.
probably that you are like family to her
Treat her like a queen and are loving to do that.
Treat her like she wants to be treated
The may like the girl but remember you only get one brother, there are still tons of datable girls out there. Preserve your relationship with your brother even at the cost of a girl.
Yeah. All of One Direction treat eachother as if they were brothers. Not just them.
Treat her like a little lady instead of a girl-chivalry does not have to be dead.
You come clean and tell the girl you like's brother that it wasn't true unless she told you she likes you.
A girl with a good heart who is smart and knows how to treat him like you would treat your paents and your friends
ask her out, treat her to a good dinner and bed her