> the bizarre subtext about Ender's brother and sister,
Do you mean "subplot?" As in that's not the plot at all?
I don't think I've heard anything good about the Ender's Game movie, and while I like the book I didn't think it lent itself to screen adaption. I've never read the original novella version of Ender's Game, which I do think continued to be anthologized after the novel came out, but I know that in that version the kids memories of their families had been wiped so that they didn't remember anything before their military training. Is that in the movie?