Is There a Relationship Between You and Lydia?

Scott mills, brother or lover to day becomes sister or kissed he fate and lydia are on the line. Just got work out if em, if they're actually related to each other, or if they're gtting it old. Fay: "I always think ther's a bit of a gruesome way of putting it" Lydia: 'But i'm either her sister or i've kissed her'