Among Henry's siblings were sister Maria Beekman (wife of Nicholas William Stuyvesant, son of Governor Peter Stuyvesant); Gerardus Beekman, a wealthy physician and land owner who served as president of the council and acting governor of the Province of New York in 1710; Cornelia Beekman (wife of Isaac Van Vleck); and Johannes Beekman (who married Aeltje Thomas Popinga).
