I am currently reading Kitty Kelly's biography of the Bush family. It is not a well written biography in the sense that rather than just telling their story, she continually interjects her judgments on them and their choices. Nonetheless, her best efforts to the contrary, one is able to construct a relatively independent view and then evaluation of the characters.
The thing that has always been fascinating to me is the question of how one family can produce 2 presidents within a generation - George HW left the White House in 88 and in 2000, George W entered the white house - 12 years. That is pretty remarkable! I don't suppose there is any one answer to that question. But in reading the history of the Bush family, a few threads start to emerge that certainly seem to echo threads in other high achieving narratives.
So far, I would conclude that achievement requires money and connections. Samuel Bush - the originating patriarch is an affluent or wealthy businessman in Ohio. But his wealth is not really trans-generational i.e. it does not secure lifestyle for his descendants even beyond the first generation. What his wealth does, is it allows him to send his kids to top prep schools and to elite universities. The value of these places is probably both in the way it helps kids to think about themselves and also in the connections and relationships that are built. And the same narrative follows his son, Prescott Bush and his grandson George HW and great grandson George W.

America, as imperfect and unequal as it is, is still probably, more egalitarian than almost any other society in the world. If you look at America's success stories - probably in the last century and certainly in the last few decades, the people who seem to make the biggest mark nationally tend to come from elite universities. Even the Facebook and Google boys are Stanford and Harvard graduates. And almost without exception, leaders in politics tend to have done a stint at Yale or Harvard.

My conclusion therefore is that part of giving your kids the foundation for success is to ensure they are (a) able to build the right mindset about themselves - by being around communities and individuals that view themselves ad world-changing leaders and that (b) they are able to build relationships that they will leverage down the road to help them achieve their goals.

If I bring that down to Kenya, then the conclusion is that sending your kids to the right schools is absolutely essential. The right schools are schools that have a tradition of excellence and leadership - ala Alliance, Starehe, Strathmore AND/OR schools where society's elite send their kids. These are the expensive schools that were primarily the domain of expatriates but that now have increasing numbers of Kenyan Africans. If your kids go to these schools, then (a) it will help them to perceive themselves as part of society's elite  and the leadership (b) they will have an opportunity to build relationships that they can leverage later on in life.

Now, this won't guarantee their success. Their achievement will come down to their personal choices.

But in terms of giving your kids a foundation for success, this seems to be as good a place as any to begin. Ask yourself (a) "which kinds of environments will cause my kid to perceive themselves as a leader in excellence and achievement? (b) where does my kid need to interact so that he can develop comfort with the upper classes and build connections that will be useful later? Go out and create access to those environments