Really, really short people?

Here's a puzzle for you. To the right are two photos. The second is just a close-up of the first.

The two mysteries are the heights and the identities of the people.

Based on a variety of clues, most particularly the recognition of the woman on the left, I believe that from left to right, I can identify: Martha McCray Scott and Jonathan Scott. This means the photo was almost certainly taken in Steuben County, NY probably sometime around 1900.

My mother believed that the baby was Mabel Scott and the young girl was Ella Scott Miller (Martha and Jonathan's granddaughter and daughter, respectively). The two extremely short people remained unidentified. This would place the photo about 1889, 2 years after Mabel's birth, and would make Ella age 18, as she was born in 1871. The girl looks much younger than this to me, probably no more than 10 or so.

I'm not satisfied that the children have been correctly identified. I think the baby is a boy. Assuming he is one of the Scott grandchildren and is about 2 years old, the picture could have been taken anywhere from 1898 to 1915. Martha and Jonathan had 4 children: William Alan (who had 5 girls); Clement Dorr Chester (3 boys born in 1896, 1908, and 1913); Permilia A. (2 boys born 1899 and 1902); and Ella M. (2 boys born 1900 and 1907).

However, Martha Scott died in 1906, so we can actually rule out a number of the grandsons; anyone born before 1905 is still eligible. This leaves us with five children: Dorr's son John Winfield Scott born in 1898; Permilia's two sons, Scott Paul born 1899 and Nelson Paul born 1902; and Ella's son Myron Reuben Miller born 1900.

The girl would have to be about 4 years older than the baby, at a minimum. Unfortunately, William Scott had children beginning in 1887, so there were plenty of older girls to choose from. Probably, it will be impossible to identify the children.

Which brings me to the oddest thing. The two people on the far right are REALLY short. There is some sloping to the ground, but it doesn't appear to be enough to explain their height. They're not achondroplasic (dwarfed), because their proportions appear normal, but they are just REALLY small. One explanation would be some kind of growth hormone abnormality... presumably genetic.

I don't have any information that says we had little people in the family, and it isn't a trait that seems to have shown up again. (Okay, so we are short, but not extremely so). And are these two married or brother and sister? If they are married, it might mean that this was a relatively common trait in that area. If brother and sister, then it still means that there is probably a genetic component. Most curious.

Does anyone have any additional information?