My Great Grandmother Margaret Gray was born in Burntisland in 1851.
Her sister Mary born c1843 married John Laing 1839-1917(born St Andrews and St Leonards son of William Laing and Helen Balsillie) in Burntisland in 1862. They had 4 children, John b1863 in Dunfermline (died in infancy) Henrietta b1864 in Burntisland, Helen b1866 Ferryport, William b 1869 Ferryport.
John was described as an Engine Driver. He died in Glasgow in 1917. Mary died in Arbroath on 8 july 1901. It looks as if they may have separated as I cannot find them together on any census after 1871