Alexis discovers the DNA test, Marco’s grandfather’s identity General Hospital Spoilers

General Hospital spoilers tease that Sidwell may actually be the son of Dmitri Cassadine — a possibility that is gradually evolving into a far more complex and turbulent storyline than anyone could have imagined.

Increasing evidence supports this theory. From the way Sidwell happened to arrive in Port Charles just as Windmir became vacant to his unusual knowledge of the castle’s history and legacy, his appearance seems far too calculated to be a coincidence.

And every move he makes carries the mark of a larger unfolding plan.

The emerging storyline that Sidwell and Marco are secretly Cassadines is pushing the narrative much further than fans initially expected.

What once seemed like a minor subplot is now becoming one of General Hospital’s core arcs, with the potential to completely redefine the identity of the most powerful family in Port Charles.

Marco, far from being just an ambitious young lawyer, may actually be a crucial pawn in the grand scheme Sidwell is orchestrating.

Marco’s approach to Lucas and then Alexis wasn’t random — it appears to be a carefully crafted move to gain trust and access to sensitive family information.

One of the most troubling twists is that Sidwell seems to possess detailed knowledge of Cassadine family history, even more than Valentin, who is long believed to hold all of the family’s darkest secrets. This suggests that Sidwell may have accessed documents and secrets Helena kept hidden before her death.

The possibility that Sidwell knows the location of hidden Cassadine assets — or that he might even be the legal heir to a portion of the empire — is becoming more and more real.

One of the most compelling pieces of evidence is that Sidwell possesses Helena’s dagger — the same weapon used to kill Alexis’s mother and later thrown into the river.

How could he have this artifact without a deep connection to the family? It’s highly likely that Sidwell has been tracking the Cassadine legacy for years, collecting information, documents, and valuable items to prepare for this very moment: the moment he steps into the light to reclaim what he believes is rightfully his.

His relationship with Natalyia, his ex-wife, is also becoming a key piece in the larger puzzle. Natalyia’s claim that she grew up in Puerto Rico may actually be a lie designed to hide her real connection to Brazil, where a distant branch of the Cassadine family is rumored to have settled.

If Natalyia is indeed linked to the Brazilian Cassadines, this could explain why Sidwell married her. It may have been a strategically arranged union to strengthen ties between family branches.

The most explosive twist yet might be that Sidwell is not just Dmitri’s son but potentially the only surviving son of Mikos Cassadine — the biological father of Alexis, Stefan, and Stavis.

Another possibility is that Sidwell is Helena’s secret child, born from an affair and hidden away to protect her status within the family.

This would explain both his possession of Helena’s dagger and his deep knowledge of family secrets that even Valentin lacks.

If Marco is Sidwell’s son, that would place him squarely in the next generation of Cassadines, equal to Spencer in the family hierarchy — setting the stage for a new rivalry over the Cassadine legacy and Windmir itself.

If Sidwell truly is Dmitri or Mikos’s son, it would mark one of the biggest twists in General Hospital history.

Not only would it shift the power dynamics in Port Charles, but it could also open up entirely new storylines involving old family secrets, buried schemes, and perhaps even the return of long-presumed-dead characters.

The arrival of Sidwell and Marco might just be the first step in a much larger plan. They may be paving the way for more members of the secret Cassadine branch to emerge — individuals who have waited decades to reclaim their rightful place in the Cassadine Empire.

This could spark a full-blown family civil war, with new alliances forming and old rivalries reigniting.

If this conspiracy is real, it would be one of the most shocking developments General Hospital has ever delivered, fundamentally changing how fans view the Cassadine family and their storied history in Port Charles.