This is how you sign Brother in American Sign Language.
Learn how to sign "brother" in American Sign Language. Form 'L' shapes with both hands, extending your thumbs and index fingers. Position your non-dominant 'L' hand by your chest. With your dominant hand, begin at your forehead as if forming the peak of a baseball hat, then bring your hand down to rest on your non-dominant hand, changing it into an 'L' shape.