Family Matters was a Perfect Strangers spin off?

Family Matters is an American sitcom about a middle-class African-American family living in Chicago, Illinois, which ran on national television for nine full seasons. The series was a spin-off of Perfect Strangers.

I really had no idea Family Matters was a Perfect Strangers spin off. Consider my mind blown.

Also, Family Matters is the second-longest running sitcom with a mostly black cast. Family Matters had 215 episodes, The Jerffersons had 253. The Cosby Show had only 197, yet somehow 201 are in syndication.

Family Matters was a Perfect Strangers spin off?