Lucy and Zoe are twins - and they share a 1-in-2-million condition that is slowly turning their muscles to bone. The sisters were both born with fibrodysplasia ossificans progressiva (FOP). The condition is so rare that the sisters are 1 of just 3 sets of twins in the world known to have it 😳 Watch here: https://www.facebook.com/watch/?v=1081607567313221