 Her maternal grandparents were U.S. Representative Jotham Post Jr. and his second wife, Magdalen (née Blaau) Post.Her paternal grandparents were William Rhinelander and Mary (née Robert) Rhinelander.Rhinelander's great-great grandfather, Philip Jacob Rhinelander, was a German-born French Huguenot who immigrated to the United States in 1686 following the revocation of the Edict of Nantes, settling in the newly formed French Huguenot community of New Rochelle, where he amassed considerable property holdings which became the basis for the Rhinelander family's wealth.