Patterson ancestors?

This photo was among a collection I received when my grandfather passed away.

I do not know who these individuals are, but I am quite sure the seated one is a relative, as there is some family resemblance to my grandfather's father, John Patterson, b. 05 Aug 1865 in West Glasville, New Brunswick, Canada. I do not know if this is his brother Alexander, of whom I have no record after the 1871 census , at age 10.

Not seen in the scan is a Photographer's marking on the bottom of the card on which the photo was mounted. It reads: Matson and Alseen, 212 1/2 State Street, Salt Lake City.