Click to see Spoiler:
Does Alexis, Sam's bio mom, know who her dad is? How can the topic never have come up? :lol But, assuming she knows, and assuming Sam's dad is a Cassadine, that would mean that Alexis either had sex with her dad, her uncle, or her half brother....are there any other male Cassadines that we know of? Of course there could also be long lost Cassadine 5th cousin...then not so weird.