Louise de Marillac married Antoine LeGras, secretary to the Queen, Marie de Medicis February 5; 1613. Michel Antoine LeGras, their only child was born October 18, 1613. He married Gabrielle Le Clerc, daughter of Lord de Chenneviere, 18 January 1650 in the Church of Saint Sauveur. Vincent de Paul witnessed the marriage contract. Louise's only grandchild Renee Louise Le Gras was born in 1651.