
I'm not defending this trash bag but what its worth but the sinclair eldest stood up as a big brother when their father wanted to sell Leila like fish in the wet market, and I somehow respect that even though through out the story he was a douche, but let's all be real you'll also feel angry/awkward if someday one of your parents brought a random ass child from an affair, and by how dysfunctional his house hold as his the only person keeping everything stich up together? I won't be even sane

I think that special 'medicine' is just water xD and that thing about the miasma is real

Agreed, I think the whole thing is a placebo effect. I think the forest thing that Perez said is true, but the “medicine” is just water like you said. It was a lure to make him stay in the forest and confuse him as much as possible. Or it IS actually medicine but prolonged exposure to the miasma overrides any healing effect that it has.
How did they discovered FL meet with her bio dad?
It might've been when Camilla told or asked (?) Ravi what he feels or what he knows about their bio dad upon discovering the origin of the ring she inherited from their mother—hinting she met her bio dad—assuming they have the same father. I'm guessing Ravi told the family.