Sarah Palin's 23-year-old son, Track Palin, and his wife Britta are divorcing after 18 months of marriage. The two have a 16-month-old daughter named Kayla, and reportedly have settled child support, property and custody issues. Track, who's a commercial fisherman, is the oldest of the former Alaska governor and 2008 Republican vice presidential candidate's five children. According to divorce documents he earns $42,800 a year and has agreed to pay $642 a month in child support. They have agreed to split any other child-related expenses, including medical and travel.