Is Nathan a Cassadine?
Any guesses as to who Nathan's father is? If you said Victor, I think you're right on target. We know there's a history with Dr. O and Victor. And it's obvious that Victor still has feelings for his former love. So it's not a huge stretch to think that Nathan is Victor's son.
So not only are Nathan and Britt siblings – there's so much more to this reveal! Nathan is a Cassadine – which means he's now related to Sam, Nikolas, and Alexis. And let's not forget young Spencer.