I have found a Mary Russell - Baptism Date 13 May 1792 - Baptism Place Wyke-Regis, Dorset, England - Father Josias Russell and Mother Ann Russell. I have found two other children as well however I cant find any marriage details.
Maybe I need to buy death certificate for Mary - maybe that will give me some information - I know she died in Hull - having moved there with Thomas and their elder children before 1840