I'm going to love it, I think. I think Charles-Henri is quite fragile mentally, quite feminine as well, which surely doesn't help - both with his role, nor with getting along with his peers. That's a sad fate, awaiting him, doing what he's disgusted by. No way he looks 14 btw, but I read Jojo - I won't complain xD
Jean-Baptiste, his father, doesn't seem to be the one, who really holds power in this family. Charles' grandmother though? She's merciless and cunning. I think I might end up respecting her a lot, while hating her for being a genuinely terrible person. That's just my first impression.
And out of all the Sanson children, the one who seems to actually be fascinated and maybe pulled towards the executions, tortures and macabre of it all is Mary-Joseph, the youngest of them all. A girl too, which might - I don't remember how equal were genders in 18th century France, but I doubt women could do much - stop her from becoming what Charles-Henri doesn't want to become.
And I'm focusing on her too for another reason - she's the only one, whose fate was not revealed to us in the introduction. Meaning, she's either going to be just pivotal, OR pivotal and made-up. Wouldn't mind either, obviously any historical fiction needs some degree of freedom to it. Gotta keep an eye on the little girl though, as she might become a psychopath. Keep her away from kittens and birds, pretty please.