Family reunion — minus one.

Erik Per Sullivan decided not to reprise his role as Dewey in the upcoming “Malcolm in the Middle” revival, which didn’t come as a shock to his former TV brother, Frankie Muniz.

“He’s very happy in the life that he’s created outside of the entertainment world,” Muniz, 39, exclusively told The Post while promoting his partnership with Autotrader and the Fasterclass campaign . “And he made the decision that he didn’t want to get back into it — which we completely respect.”

Muniz said that the rest of the cast — including his TV parents, Bryan Cranston and Jane Kaczmarek — did not want to “force” Per Sullivan, 34, “to do something he didn’t want to do.”

“We had his blessing from day one to have the role be in the show and recast it,” the former child star

See Full Page