Thanks Pamela, this is great and I have ordered the marriage cert so fingers crossed. I would presume there is a catholic connection with the name Mary Frances and she did have 10 children. I have found that 5 of the children were born in Buenos Aires and they were all baptised. From the baptism records I found the name Mary Frances Loudon, which then led to passenger records which give her name as Mary/May Frances Brown, so I'm not sure about Mary Jane. Sadly the only lead I had was that my great grandad was born in Argentina and 1901 and 1911 census records led me to Mary as his mother.