SARAH PALIN’s son busts up with the missus.

Her eldest, Track, jumped the rails on his marriage by filing for divorce.

Track and Britta Palin jointly filed in an Alaskan court.

Under the 49th State’s marriage code, by filing jointly, they are telling the courts they have settled custody issues and settlement claims.

According to reports, the agreement says Track and his wife must watch a nearly hour-long video on “How to Explain Mommy and Daddy Are Getting a Divorce” to the child.     

As The ENQUIRER reported way back in 2008 when Mom was a GOP VP candidate, Track reportedly ran afoul of the law and joined the military.

The commercial fisherman and his soon-to-be ex were married in May 2011.