We have a few dark sheep in the family

The Sopranos title screen. (Photo credit: Wikipedia)

This is a mash up of “black sheep” (disreputable member of a group) and “dark horse” (something or someone who is little known and rises to prominence).  It was uttered in The Legend of Tennessee Moltisanti,  the eighth episode of the first season of The Sopranos.:

Dr. Reis: You know, on my mother’s side, we have a few dark sheep.
… Louis “Lepke” Buchalter, you know, Murder Incorporated. My mother’s
uncle was Lepke’s wheel man, his driver.