If each of you is really protective of the other, maybe a +1 dodge bonus to AC when adjacent to one another?
Or, with a successful aid another action with your sibling as the one being aided you grant a +3 instead of a +2 to their roll?
If you're more competative, then maybe +1 to damage if you attack the same target in the same round? Or a +1 bonus to will saves when you're within line of sight of your sibling?
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Taking one of Dal's ideas...
Trait: Familial bond
You and one of your adventuring companions were raised together, and are particularly close.
Benefit: You and another character both take this trait. You bestow an additional +1 trait bonus when providing a flanking bonus or aid another bonus to the bonded character.
In addition, you automatically succeed your Bluff check to successfully deliver a secret message to the bonded character, regardless of your actual roll, although others may still attempt to decipher the message with an opposed Sense Motive check as normal.