Three Little Girls

This photo was hanging in the living room of Darling and Margaret Miller Jones in Weakley County, Tennessee.  After Darling's death in 1909, the house was inherited by William "Buck" Orr.  It's therefore conceivable that these girls could be Orr relatives, but I doubt it.  They bear a strong resemblance to Darling's granddaughters, the children of John Miller and Caroline Patterson Jones - but the relative ages seem wrong.  Are they Jones, Patterson, or Miller daughters?  Who are they?