black sheep (of the family)

Translations
белая ворона (в семье)
John has always been the black sheep of the family.
Джон всегда был белой вороной в семье.
Definitions
A person who is considered odd or different from other members of their family, often because they do not conform to the family's expectations or standards, and may be viewed with disapproval or as an embarrassment.
Words
sheep

noun
овца
black

adjective
чёрный