Thank you for keeping the romance short, it seemed a little forced.

The Maguire Spiderman movies are at least better than the Andrew Garfield ones.
Are you going to include the Deadpool from Wolverine: Origins?

The mom and son relation getting rocky is a good one. That way you can develop the character. The relationship gets more and more rocky each time till they both are pushed away from each other. The mother feels regret and the son feels hate. You can kill the mother of later in the story by letting her sacrifice herself for her son as a last good thing for them both. And let him discover a diary or something where she tells that she wanted to sent him to Xavier and where he also discovers that his mother always loved him even if they had it rough.

It's a brainstorm. But good chapter

He needs serious therapy.
If Byron runs into the Hulk or S.H.E.I.L.D. maybe he can get help from Doc Samson.

Good start, I remember the movie so I can visualize the actors who played the characters you're writing about.
At eleven years of age it may be a bit young to go out into the world, doesn't mean he has to go with the X-men, maybe he goes with the Morlocks or he gets picked up by Weapon X(Wolverine) or Simon Marshall(Cloak & Dagger).

The chapter is good. You can go all the way with it. But one thing I noticed is that you follow the last Stand arc. While you could have used the first x-men movie. That way you can develop a character more over time. An idea: "His mother beat him when he was little so he went to his aunt but after his powers became stronger. He got taken in the X-Men house." Someway you can make a twist that he joins his mother (she is still a terrible parent) in the brotherhood but while he is there he starts to reconnect with her till he finds out that one of his teachers killed the very same person that took him in. He questions the motives of the brotherhood and in the end deflect from it to stand tall with the X-Men.

I wouldn't mind him getting rescued. It would help show him the differences in how mutants think based off of their environment and where they are raised. His opinion on mutants thinking they are superior will be able to shift to some degree if he were with kids at the school who just want to live a life without fear of being killed or tested on.

Love the idea I love to see how far you can go with the story and character.