A retiree spends nine years relentlessly seeking to prove that his son-in-law, a former Green Beret Army doctor, murdered his pregnant wife and two daughters.A retiree spends nine years relentlessly seeking to prove that his son-in-law, a former Green Beret Army doctor, murdered his pregnant wife and two daughters.A retiree spends nine years relentlessly seeking to prove that his son-in-law, a former Green Beret Army doctor, murdered his pregnant wife and two daughters.