1) Skill is a strong predictor of working income.
2) Skill is a strong predictor of wealth for low-to-medium levels of wealth, but becomes less and less significant as we move towards higher levels of wealth.
3) Parents' wealth, controlling for skill (so, excluding its effect from the analysis), is not a strong predictor of working income, but a really strong predictor of financial income (rather obvious).
4) Income, controlling for parents' wealth, is a strong predictor of wealth.
5) Parents' wealth, controlling for skill, is the single strongest predictor of wealth.
Usually these studies conclude that a western-civilization citizen born poor but with high levels of skill can "easily" reach a medium-to-high level of income, yet will difficulty reach a high level of wealth, but will still "easily" reach a level of wealth higher than his parents'.