black sheep

(noun) the most unpopular member of a family

Example Sentences:

I went to Medical school and became a doctor. My sister didn’t go to school and became homeless. I think that she is the black sheep.

Mark became the black sheep of the family when he married a girl that nobody liked.

A: Who is the black sheep of your family?
B: My cousin, Bob.
A: Why is he the black sheep?
B: Because he spent 5 years in jail for stealing from our Grandmother.
A: Oh.

Media:

Similar idioms:

1. the pot calling the kettle black
2. spick and span
3. take one’s medicine