So, I was looking for sci-fi mystery slop and remembered I only got part way through the first season of Dark, the German (relevant in the spoiler tag) Netflix time travel murder mystery show. I really like the take on time travel, though I have to say it is very very funny that:
spoilers for season one and two of Dark
The time travel rules conveniently mean that they cannot travel to anywhere between 1920 and 1953 since its "present day" takes place in 2019 and the wormhole discovered conveniently only goes 33 years in either direction.
But the real reason I felt compelled to make this post is about the twist in season two where it is revealed that Oops all incest. That's right guy ends up accidentally becoming his own grandpa (literally) and causing an apocalyptic temporal paradox and because of said paradox it is revealed the over half of all romantic relationships in the show are unwittingly incest.
It isn't sci-fi, but if you liked Dark, you may also like Babylon Berlin.