A McIlhago Emigration ?

The findmypast internet site gives three records of McIlhago journeys to Canada. In 1950 Sarah McIlhago left Liverpool and arrived in Halifax. She gave a birth year of 1896. She was therefore 54. Six years later Harry and Sarah McIlhago left Greenock and arrived in Montreal. They gave birth years of 1893 and 1895, so were 63 and 61 respectively. Clearly this could have been the same Sarah travelling twice. I have no evidence from these or other records that Harry and Sarah were married, though I do have one record that probably ties in. A Henry McIlhago was born in 1893 at Cadder, Lanark, Scotland, though to whom I am not sure. He however appears to have died in 1969 aged 76, in Glasgow, Scotland. He could of course have emigrated for a short time, or indeed just have been visiting, and then returned to Scotland.