Margaret was loyally devoted to her birth family her entire life, who was greatly benefited by her royal marriage, and often successfully used her as mediator for benefits from the king. Several of her male relatives was given offices by the king, and her sisters benefited from favors granted to their spouses: her sister Anna's spouse was made the greatest landholder in Östergötland and her sister Brita's spouse the equivalent in Västergötland, while her widowed mother and maternal grandmother Anna Karlsdotter was granted personal lands and the right to the income of personal taxes from their peasantry. On a personal level, Margaret seems to have been closest to her sister Martha, who is most frequently mentioned in her correspondence, addressed as "The Dearest Sister of My Heart" and who more often than other family members successfully asked her for mediation with the king on behalf of herself, her spouse and supplicants.