Mary Gerrard Joseph Gerrard

Does anyone know anything about Mary Gerrard or Joseph Gerrard. I will tell you what I know. Joseph Gerrard was born apx 1803 he married Mary Gregory on 5 Febauary 1827. He was a Doctor. He died apx 1857. He had 9 children on of which was Mary Gerrard. Mary Gerrard married James Milne of the 4 September 1875. This is all I know about them. I would greatly recive any information on either of them. I would love to hear from anyone if they think they are related or have information. Thanks.