Margareta was the daughter of Karl Gustavsson but her mother is unknown. The date and place of her birth have not been found.
Her husband was Filip Ulfsson Ulv, who she married in BEF 1319. The place has not been found. Their three known children were Ulf Filipsson (<1319-c1350), Karl Filipsson (<1320->1333) and Ingrid Philippsdotter (?->1344).