It's splitsville for Sarah Palin's son Track and his wife Britta Hanson.

Tying the knot in May 2011, commercial fisherman Track, 23, and his high school sweetheart filed joint divorce documents in an Alaska court, TMZ reports.

In accordance with state law, their joint filing confirms they agree to property and custody terms as well as child support for their 1-year-old daughter, Kyla.

The Palin family's oldest son married nursing student Hanson in Hatcher Pass, Alaska, with both sets of parents present at their ceremony. "Our families couldn't be happier!" the Palin and Hanson families told Us Weekly in a joint statement at the time. "These are two hard working, humble, active, studious young adults who grew up together. We're tickled that after two decades of friendship we proudly witnessed their marriage, knowing their new life together will be blessed."

Also an Army reservist, Track is the eldest of five Palin siblings: Bristol, 22, Willow, 17, Piper, 11 and Trig, 2.

Track's daughter is Sarah Palin's second grandbaby. Bristol Palin was just 18 when she and ex-fiance Levi Johnston welcomed son Tripp in 2008.

This article originally appeared on Usmagazine.com: Sarah Palin's Son Track Divorcing Wife Britta Hanson After 18 Months of Marriage