Fatai Okoya, son of billionaire businessman Razaq Okoya, has publicly asked for forgiveness after four decades of separation from his family. He traced the rift, stretching back some 40 years, to an old dispute over money. His marriage also features in his account of how the ties frayed and the silence set in. The Okoya name sits among Nigeria's best known business dynasties, which explains why the appeal spread quickly online. A rupture that deep inside such a prominent household, spelled out in public, is unusual by any measure. There is no word yet on how the patriarch or other relatives plan to respond. The plea has stirred debate about family grudges among wealthy Nigerian families and the damage that comes when grievances run for decades.