We have assumed there are two options: Bradford, or her adopted (?)father. But what if there is a third option? We don't know who else Fey slept with but we get the general impression she might have slept around quite a lot. I mean,this is a telenovela and she did sleep with Bradford when she knew he was married.
I seem to remember that in episode thirteen, a fashion TV presenter said that OSHI had an "extremely" close friendship with Fey? In the world of telenovelas, this means he was sleeping with her. Micheal Urie mentioned in an interview I think that the discovery of who Amanda's father was was "really gross". I would have thought that was Bradford but maybe they decided that was too obvious. And it is a bit obvious isn't it? Everyone's been speculating about Bradford and no one at all has mentioned Oshi. It would be a bigsurprise anyway!