Kevin Costner's estranged wife has reportedly demanded a substantial sum in child support. The exact amount requested has not been disclosed. The couple, who have been married for over 16 years, have three children together. Since their separation, Costner's wife is seeking a significant financial settlement to support their children. The former couple's legal representatives are said to be in discussions to reach a resolution. The specific figure remains a mystery, but the request for a substantial child support amount is at the center of the ongoing negotiations.