I got 2 large pencil sketches from my grandmother's estate. On the back of the man's picture is "Thomas Morton / My Mother's , Mother's Father / Mrs. C. W. Austin's Grandfather / Sketched 1889". It looks like my grandmother's writing but I'm not a handwriting expert.
Added in a different coloured pen is "Bigger frame holds Mabel's Grandmother"
Mrs. C. W. Austin, Mabel is [Jones-959]. Her grandfather is [Morton-6313] and her grandmother is [Morton-6314]
The man's picture is 22 cm by 28 cm The woman's picture is 17.5 cm by 37 cm