Wait so ethan is blair and torres kid?

No? I think Ethan is from the family that helped hid Blair

Ethan is definitely a human.

I don't think so..? I'm not sure if guys becoming pregnant can be a thing in this kinda story, but Blair and Torres met back in the day and Blair wasn't even an adult yet at the time so I doubt Torres would've allowed it to be...
I think Ethan is just a human who happened to be at the wrong place at the wrong time and got caught up with them..? It's just an assumption since they didn't make it very clear.

I got so confused on this too?

Nope ethan is from the family that hid blair when there was a hunt in the village and i think blair has become the family’s personal watchmen since the old times and tries to protect any of the human from caine family from being in contact with non-humans (grey for example)