Catherine is a daughter of Anne Jane McCan and Patrick McLean/McClean. She is a sister of James McLean, my great-great grandfather, whose marriage certificate I have. Both of them list '222 Church Street' in Glasgow as their address on their marriage certificates. She married John Joseph Sweeney in 1881. They emigrated to Australia.
Yes, I have the marriage certificates of George McLean (my great grandfather) and his brother James Joseph McLean, both married in 1920. There are several censuses with couples that might be them (though this is not certain) which include reference to children: Annie, Ellen, Jeanie, John, Mary A, Thomas, Hughie, and James and George. However I don't believe this is the correct family, as it seems to link the bride to an Annie McCulloch.
Catherine's marriage certificate:
2nd December
St Mungo's Chapel, Glasgow
Groom: John Sweeney
Occupation: Serving Machine Packer
Status: Bachelor
Age: 22
Address: 222 Castle Street, Glasgow
Parents: James Sweeney (deceased) and Jane Sweeney, previously Blakely, M.S. Alexander
Bride: Catherine McLean
Occupation: Pottery Worker
Status: Spinster
Age: 19
Address: 222 Castle Street, Glasgow
Parents: Patrick McLean (Coalhill Labourer) and Ann-Jane McLean, M.S. McCann (deceased)
Witnesses: James Lanechan and Margaret Hart
And the information I posted above, which I think must read 'invited, N. McGuiness'
I have also just discovered a record of James McLean's birth (my gg-grandfather), in the records of Loughall and Tartaraghan Parish, County Amargh, 25th September 1859. I have attached the image.