Long before the whites arrived, Africa had working structures that catered for all her challenges. We were a stable society that catered for all levels of people. Ground rules were intelligently set to ensure there was orderliness at all levels. The eldest son had to marry first followed by the next son in a descending fashion to the last born.
Any challenge that would disturb that order was dealt with and removed to ensure that respect was maintained among siblings. If a younger sibling was quicker in making wealth, it naturally became his duty to ensure that he paid dowry price for an older brother to get married in order to clear his path to marry his own wife.