More specifically, they are both in the same genus, Mustela, meaning they are closely related.
However, ferrets are domesticated and bred from the European polecat (Mustela putorius furo), while stoats are wild animals (Mustela erminea).
Is a ferret related to stoat?
Yes, ferrets and stoats are related. They both belong to the same family, Mustelidae, which includes weasels, badgers, otters, and wolverines.