Lol, yes, it was 35 years ago that I saw the marriage certificate, and license. I remember well because there was a $1.00 stamp on the license, which I 'borrowed' for my stamp collection. (Yes it was pretty rare)
I can certainly go back one generation further, and get you some photo's of Asal and Julienne, Mina's parents. I can also get one photo of Mina's sister Edna, with her husband and son in 1937 or so. I am not sure about other Mckay family photo's though. I will see what can be found and forward whatever I can get copies of.