I have had access to my Grandmother's pictures and she has none of Robert McCormick or Mary McMillan.
Her Father, Heugh McCormick was born of William McCormick and Eliza Beggs. I have the birth certificate. 1884 - Southend Argyll.
There is a surviving sister, Helen McCormick who refuses to allow us access to her pictures. She has her Mother's (Martha McMaster McCormick) pictures.
Could you scan a photo of Archie and send to me at my email address. I enjoy searching for family resemblance in others. I had found a photograph of a Suzie McCormick, 1875 residing in Illinois. I had sent it to my Father and he had asked me why my sister was dressed like that. The likeness was astounding.
I'll keep looking time permitting for Mary's photograph.