Tiffany has progeria, a condition that causes her to age rapidly - yet she's already outlived her life expectancy. Single dad Ryan was born with Arthrogryposis, leaving his arms and legs fused. 

An allergic reaction left Kirtus with vitiligo, alopecia, and bone loss. An upcoming surgery could change his life. Portia's rare skin condition may exist in fewer than 25 people worldwide. Dani lost all four limbs, and now she fights to walk unassisted.