Technically, from Joe Robbie's death in January of 1990 until Elizabeth Robbie's death on November 5, 1991, she was also a majority owner of the team.  Wayne Huizenga, who had bought a 15% interest in the team and the new stadium, had first dibs (is that a legal term?) on purchasing the team from the children heirs when their burden of estate taxes (47 million on 200 million in assets) came due.  So, you could list not only Elizabeth Robbie, but also the children as owners at different points prior to Huizenga's purchase.