I'm Not Quite Sure

The young man in the upper right is Harrison Bucklin, my great-great-uncle. On the back of this print was scrawled "Harry and Etta Bucklin." My guess is that Etta (Henrietta) Bucklin (Hoffman), who married Harrison Bucklin, is the young woman seated below him (lower right). Who is the other young woman? Isabel Bucklin? Is the older woman in the middle Clara Elizabeth Bucklin (Shearer), 1857-1884, my great, great, grandmother? And who is the child? Could it be Marcella? Or maybe Clara?

There ought to be some clues in the rest of the portraits, and in the cyanotypes in the Tidioute album.