According to court filings first reported by the Alaskan media, 55-year-old Todd filed for divorce from Sarah, also 55, on Friday.
He cited “incompatibility of temperament between the parties such that they find it impossible to live together as husband and wife,” according to a copy of his divorce complaint, dated Aug. 27.
(According to the Washington Post, “incompatibility of temperament” in Alaska is not unlike “irreconcilable differences” in other divorces.)
The divorce records, which have been reviewed by PEOPLE, list the plaintiff and defendant only by their initials — T.M.P. and S.L.P. But Todd’s middle name is Mitchell; Sarah’s is Louise. The listed birthdates for both parties also match the Palins’ birthdates, and the filing lists their same marriage date and the birthdate for 11-year-old son Trig.
Todd is seeking joint custody of Trig, according to the complaint, and fair division of their assets.
A listed attorney for Todd didn’t immediately respond to PEOPLE’s request for comment; neither he nor Sarah immediately returned messages.
The two eloped in 1988 and have five children together.
Sarah, elected as governor in 2006, left office three years later after joining Sen. John McCain‘s ticket as a vice presidential candidate in his unsuccessful run for the White House. She later became a reality TV star and commentator.