Magnus was the son of Trotte Pedersson Eka and Ingegärd Johansdotter Bjälboättens. The date and place of his birth have not been found.
His wife was Märta Magnusdotter Kase. They were married, but the date and place have not been found. Their two known children were Karl Magnusson (?-<1473) and Greger Magnusson (?-?).