Isn't that frustrating? I believe that my Louisa Dupuis Wells Tetro Lauer St. Onge (!) may be a sister to your George and Francis Layton.
Louisa Dupuis, b. 4/10/1836 or 1838 in Ogdensburg, St. Lawrence, NY. Documents from her own mouth say her maiden name was Dupuis and went by Wells. Married Oliver Lower in 1852 and moved to DeKalb, had ten children including Oliver, Louis Albert, Hortensia b. in Wisconsin, Emory, and one girl who died in the poorhouse. Oliver Lauer/Lower ran off to the Civil War and left Louisa and the kids in the Canton Poorhouse (jerk). The poorhouse gave her kids away and Louisa Dupuis Wells Lauer went back to Ogdensburg and lived with cousins until 1871 when she married Charles St. Onge (she thought Lauer was long dead). Louisa Dupuis and Charles had Marie Louise, Angeline, Celia, Bertha, and another baby who died. Lauer showed up in 1895. Louisa stayed with Charles.
The pension affidavits say Louisa was also known as Louisa Tetro.
I beleive that my Louisa was abandoned by her parents by 1850 and that the reason I can't find her in the 1850 census is because she was working as a domestic somewhere. But she always swore to be born and raised in Ogdensburg.
Emery is not very common, I keep hoping I can find an Emery Dupuis.
Have you found any more info on the sisters?