Brother & Sister

Brother: Variation:
Here is a variation of the sign for "brother." This sign is made by first signing "male" or "boy" as if you were grabbing a cap. 

Next, bring both index fingers together in front of you. 

The second half of this sign (two index fingers close together, pointing forward) actually means "SAME." 

Memory aid: BOY + SAME = BROTHER: Think of two boys from the same family.

Sister: Variation:
Here is a variation of the sign for "sister." It is made by first touching your cheek with the thumb of your right hand, as when signing "female." 

Next, bring both index fingers together in front of you. 

The first part of this sign, if signed by itself means "girl" or "female." The second part means same.
Memory aid:  GIRL + SAME = SISTER.  Think of two girls in the same family.