It's Anthony isn't it? He's the one trying to kill mc. That's why he sent the mercenaries to kill him at the beach house location and when it didn't work, he made Trino take the fall for him and he did because he was loyal to Anthony.
I don't think so, he was furious when the attempt on MC happened, and from what we've seen of him I don't think he'd be a good enough actor to pull that off unless it was sincere, also the mercenaries would risk getting gracie and luna caught in the crossfire
Now why? I don't have a satisfactory answer for that. It could because Anthony and MC are brothers (Cordia clearly was in love with MC's father and they had anthony probably and then he left her or perhaps he was cheating on MCs mother with cordia).
unfortunately and despite my very logically constructed theory above, iirc hopes has confirmed that there is no incest in this game,
and we do get it straight from cordia that she is not the MC's mother
Also Gracie said that mc was a hostage and not a guest once. She's a smart girl. I think MC's father is a real big fish. And cordia is using MC as an insurance policy more than anything.
His father is a complete unknown (I do have a theory... no I mean a real one, not the one up there), but I think it's said at one point (maybe a conversation you catch on the spy cams? can't remember) that the reason has to do with his mother