*sigh* Gotta upgrade from Equestria Millennium, man. Equestria XP has those fancy auto-updates. If your world has the resources, go all the way to Equestria 7. *shuffles updated pny.sys file for Equestria Millennium over to you* >_>
I don't think Nebby was jealous of his sister and was more worried about the boop it's self, because Nebby has perfected the art of booping so he realized that his little sister's boop was unrestrained and possibly dangerous.