She also asked for CS and sole physical custody for a child who will be 18 in a few months

well- thought it would be the other way around but she filed..

http://www.dailymail.co.uk/tvshowbiz/article-2650878/Split-Melanie-Griffith-filed-divorce-husband-18-years-Antonio-Banderas-citing-irreconcilable-differences.html