John St. Clair of Hermanston (1632-1666) (1632–1666) Parents Sir John St. Clair of Hermanstoun Elizabeth Sinclair Children Mary St. Clair Henry St. Clair, 1st/10th Lord Sinclair John St. Clair Siblings Thomas St. Clair George St. Clair Matthew St. Clair Robert St. Clair Matthew St. Clair William St. Clair Partners Catherine Sinclair, Mistress of St. Clair