
the ancient Egyptian mythology was, well, pretty incestual, so I wouldn't rule it out. Mojito, the author, has not shied away from anything regarding that aspect from the ancient lore, so I doubt anything is completely off the cards.
there are a bunch of theories about plot points on twitter. you could check them out

woah this comment got a ton of dislikes but are people forgetting that this story is basically incestuous? that the gods all came from Ra? and they're marrying their brothers and sisters? y'all forgot Seth is Horus' uncle???? but I get you guys haven't seen the final form of Anubis yet so you don't like the thought of shipping them. but if you've seen fanarts then you'd know why

Yeah that's exaclty what i think! Just imagine,
you have a familly, you decide to have a child;
and so you do and you've been raising your child from day 0 and then suddenly they're handsome so you want to fuck them???
In our society with regular parents never do they think that.-. if you saw your child and thought "they're beautiful" you would think something like "i'm proud of them, of even of yourself jockingly"
SO yeah, big no to this ship because it's just weird, people do not develop feelings like this for their children and it's for the best!
I get that this is a kink but where does this need comes from?
Ask yourself why honnestly i want to know; is this because it is forbidden? Or because you saw a chemistry only between these two people? (but then again it's kinda low to think "they are both hot they go well together" x"D (not kinkshaming though i would just like to understand how people's minds work!)

Yeah, imagine that. Given that Ra even criticised these four gods, Seth, Neftys, Isis and Osiris, for becoming weak due to insisting on living the human way, marrying and forming families in the human style, and upholding the same moral values and sexual taboos that humans upheld... Lol, Seth x Anubis would be super ironic

And you're right, I was wrong, I just checked and there are *plenty* examples of Mother-son... it's actually kinda weird how it's often mother-son and not father, daughter, though... That and the amount of "mother tricks son into bedding her" (eeeewww) makes me wonder who were the ones that kept thinking this stuff up (eeewwwww)
Is it bad that I ship Anubis with Seth too? :3 They're not real father and son anyways :3 Anubis will be going through some changes soon too (=・ω・=)