Sadhbh was turned into a deer by the druid Fear Doirche she in deer form now was than caught by Fionn, but he did not kill her because she turned back into a human. Fionn settles down with Sadhbh and they have a son Oisin, but the druid turns her back into a deer after she gives birth and thus she raises her son as a deer.
Sadhbh (mother that turns into deer)
Fionn (father)
Oisin (son)
Fear Doirche (Druid)
The answers is C the story of OISIN.
