The former wife of Zimbabwean businessman Wicknell Chivayo is set to take joint control of his estate alongside his sister, in a development that could reshape the handling of his multimillion-dollar fortune and an outstanding US$25 million (about Sh3.2 billion) matrimonial property dispute.Sonja Louise Madzikanda and Esther Chivayo reached an agreement to jointly manage the estate of the late businessman, who died in a helicopter crash alongside his wife, Lucy Muteke, in September.