I have seen a lot of this more up to choice then anything. I went to one of the top 50 High Schools in the U.S. and Education wise, everything was available to us as long we worked for it. There where always others who either took the opportunity and made something of themselves or didn’t.

The same goes for speech that is also a choice. If you want your child to speak better, do it yourself. Children learn speech by example, just making sure they speak properly in the home is enough.

Theres, sibling rivalry in every family once it gets large enough. I know a rich white family with 5 kids and they argue all the time.

All your issues seem to just boil down to class.