Suzanne was the daughter of Sigers de Ghermines but her mother is unknown. The date and place of her birth have not been found.
Her husband was Eustache de Guînes. They were married, but the date and place have not been found. Their five known children were Baudouin I (c1038->1091), Guillaume (c1040-1071), Ramelin (?-?), Adèle (?-?) and Béatrix (?-?).