Responses
The number of person who could be the father is very limited.
Louis only knows that he met the duke and was seen with someone with red hair.
I would guess that Allail is someone of the royal bloodline who able to impregnate males, and who probably has red hair.
I think he rules out Maetel, because of the hair color and he never mentioned that night. I mean Louis is so oblivious, he is still convinced that Maetel is in love with someone else.
Is Allail one of Martel's disguise? Louis never thought of Maetel as a possibility because the only two people he had action with that night was the mf duke and this Allail person.
Soooo...
The only time shit's gonna be revealed is if these dumb assess actually TALK to each other.