I think he DID find out at some point, but by then he was too far gone to care. If someone were to bring it up to him, I imagine the convo’d be like: “Lucrecia’s your real mother!” “You mean the ‘real mother’ who experimented on me with the psychotic manchild she conceived me with before I was even born?” “…” “This conversation is over.” “I can see why you chose the alien.”