adoptive identical twin 

Someone who is the smarter one of identical twins,hence the term.

Brock is Uriah's adoptive identical twin, since Brock won a medal at high school graduation and Uriah did not,Brock was always on the honor roll while Uriah never was,and finally,Brock went to college while Uriah just worked after high school.
Musa is Harun's adoptive identical twin, since Musa won a medal at high school graduation and Harun did not,and Musa always made dean's list while Harun never did.

adoptive identical twin by JMC70 January 8, 2017