People are still theorizing this after 5 years? The only thing people have to back that theory is the fact they both have blue eyes.
Forget it my man, not happening. The only "incest" this game may see will be between Lena and her step-father, as it's already been hinted at, she has choices involving him, etc. Still pretty hot though.
They're not gonna shoehorn incest in over half a decade into development, it was introduced early on in the first game and it flew under the radar because it was a fairly small part of the game. But at the point we're at in ORS, it'd be a big deal and given how strict Patreon is regarding incest, the game would be nuked right away.
It may sound like I'm being grumpy and pessimistic over this but it pains me to see people speculating in hopes of things that very obviously won't happen.
Ian having a gay scene? Unlikely, but could happen.
Seymour having been Lena's father all along after they already fucked multiple times? It's time to let go, man.