Hi!
I don't know, guys, call me blind, maybe you'll be right. But I suddenly saw that young Cassie is very, very similar to Haley. i mean scene MC+Cassie+angry Cas's dad, Cassie jumps from 2rd floor.
I have a suspicion that Cassie herself is inbred, and apparently not in the first generation of inbreeding. Because she has a problem with getting pregnant - that's the least. And she practically passed herself on almost unchanged to her daughter. Children are a photocopy of their parents - this is a sign of inbreeding. Well, or the prepotency of the parents.
and also - why does Cassie's mother, Leana, have an incurable disease? This makes the version of Cassie's prepotency (with fact of impregnating problem included) insignificant.
also why Cassie's twin-sis dies?
let's look a little differently, for example - Riley from "proud father" also experienced some difficulties with genitals, and she is reliably inbred (brother + sister) - which surprises me a lot, inbreeding in the early generations practically does not manifest itself, and here the brother and sister gave birth to a daughter with problems - maybe the brother and sister themselves are inbreds? well, most likely, yes, because the brother's wife, Kat, was "normal" and therefore the other daughters, namely Hayley and twins Rebecca+Ashley, were born completely healthy, and Zoe (from Michelle) is also healthy. only Riley has problems.