 Cecilia had attestedly son Birger Filipsson, Lord of Idö, executed by beheading as rebel on 20 August 1280, and daughter Ingegerd Filipsdotter.Concluded from, among other reasons, the occurrence of the names Knut and Cecilia among Jon's close descendants, her eldest son was Jon Filipsson who was executed as rebel in 1280.Similarly, she presumably had at least two surviving daughters, of whom it is not known if one of them were with the name attested daughter of hers, Ingegerd