Hello Christine,
My grandmother was Lena Mildred Karran (1899-1970). Her parents were Thomas Edward Karran (1864-1939) and Helena Edith Hodson (1869-1945). Thomas Edwards parents were Thomas Karran (1831-1912) and Elizabeth Gell (1829-1901). Thomas' parents were Thomas Karran (1800-1834) and Margaret Gill (1799-1874).This Thomas had a brother John who married a Jane Watterson in 1839.I wonder if this is the couple you refer to?
Thomas Edward had 2 sisters (Martha Jane and Ada) and 2 brothers Richard Henry and John Joseph (1862-1959). John Joseph married Isabella and I think they had 4 children: Josephine, Linda, John and Thomas Howard. John died in France of wounds in 1916.
Please contact me if you think there is a connection.
Catherine.