How old are you?
Why would u want to manipulate your best friend?
Not a great idea.
Why play games? Nobody likes a manipulator.
And you sound like a very dear friend for wanting to make him jealous.<br />
..now go update your profile with your real age.
People either "get it" or they don't. Using immature tactics in hopes it changes them almost never works out.
Here's an idea... maybe tell him you feel you're not valued/important. If he doesn't change that, look for a better friend!
Don't try to "make" anyone else do anything.<br />
The only person you should try to control is yourself.
date his younger or elder brother<br />
if he is alone date his friend