Hello, this all seems too much of a coincidence, they must be the same people. I only know Agnes died at 6 King Street. When Thomas married he was living at 81 Old Vennel, Glasgow. His children were James b.1865, Helen(or Ellen) b.1869, Agnes b. 1870, Thomas b.1873. There was also Kenneth Maning shown on 1881 census as been adopted by Thomas and by 1904 his name was changed to Kenneth McArthur on his marriage certificate. Hope this helps