Cushman's answer is the correct one. You simply need to have some children. It doesn't matter how many you have as exponential effects will quickly swamp any li

Cushman's answer is the correct one. You simply need to have some children. It doesn't matter how many you have as exponential effects will quickly swamp any linear effects of having more than your share now. What determines if you are a common ancestor is the particular genes you carry: do they give the carrier enhanced survival benefits? I can see someone like Kobe Bryant or Brad Pitt being a common ancestor. Edit: thinking about it more, there is something you can do: have as many children as you can with as many genetically diverse women as possible. The key here is diversity, you want to pair your genes up with as wide a range of genes as possible. The reasoning is that we can't predict what environment will be exerting selective pressures in the future. Thus the important factor is genetic diversity. This is basically hedging against unknown changes in the environment. Also, teach your kids to not be racist, so that they will do the same and pass that tendency onto their kids...