Catherine St. Clair Peerage person ID=198462 Parents Grizel Cockburn Henry St. Clair, 1st/10th Lord Sinclair Children Sir Henry Erskine, 5th Baronet Sir Charles Erskine of Alva, 4th Bt. Siblings Henry St. Clair unknown daughter St. Clair Grizel St. Clair James St Clair David St. Clair Elizabeth St. Clair John St Clair, Master of Sinclair Margaret St. Clair William St. Clair Matthew St. Clair Partners John Erskine