Warning: This story contains major spoilers from the midseason finale ofGreys Anatomy.

Read at your own risk!

How many people at Grey Sloan have secret siblings?!

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Credit: Tony Rivetti/ABC

Meredith (Ellen Pompeo) then discovers that Owen had a sister he never told anyone about.

shares a drink with him in the closing moments of the midseason finale.

What can you tease of whats really going on here?

MARTIN HENDERSON:The honest answer is I dont know exactly.

Weve shot a few episodes since the one that airs tonight.

They both have very different perspectives of what the actual circumstances were.

We do know that Owens deeply resentful and angry that Im back in his sphere.

Really, the details arent quite clear yet.

Its hinted at that, at one point, Owen and Riggs actually may have been quite close.

Thats what I would assume.

That definitely seems to be the assumption, but the details are very sparse at this point.

They were clearly somehow connected through family and some relationship with the sister.

What are the best theories youve heard so far in regards to what might be going on?

Some people say I was operating on her and she died.

Ive heard all sorts of theories.

Its all very vague at this point.

Will we see any flashbacks to his time with Owens sister at all?

That would be cool.

That would be nice.

But I havent been told thats the case or the plan.

Its probably a pretty good guess [and] not outside the realm of possibility.

Since Meredith knows the truth, what does Riggs dynamic with her look like moving forward?

Though Owen doesnt give too many details, we know that his resentment runs really deep.

He does not paint Riggs as a sympathetic character at all.

Based on her loyalty to Owen, Meredith chooses to side and be loyal to him.

Hes not the kind of person whos going to run around proclaiming his version.

Hes not interested in the politics of what he does so much as the professional job.

It certainly does for Amelia, given what shes endeavoring to do with her sobriety.

Riggs being completely ignorant of that fact is acting purely in a sociable way with no ill intent.

Hes not made aware of her alcoholism.

Even now, I dont think theres been a scene where that information has been relayed to him.

Obviously thats something no one would feel good about.

It would just fan the flames of contempt, Im sure.

It would be one more indicator of how much they should hate him.

Will Riggs find any allies at Grey Sloan?

He was privy to that.

They clearly have a bond and trust there.

Thats definitely an ally he has.

Also, I think, with Maggie (Kelly McCreary) as well.

Theres a shared professional respect there.

He probably feels theres an ally in that camp.

Im the wolf in the sheeps den.

Is he a good guy or a bad guy?

Will the competitiveness between Maggie and Riggs continue?

What I like about him is hes very apolitical.

I dont think he really cares about winning friends over so much as just doing his job.

If some people respect it, they will, and other people will find its not to their liking.

He really knows that he knows what hes doing.

Hes not shy about stating his confidence.

Greys Anatomyreturns Thursday, Feb. 11 at 8 p.m.