I've been searching around for further information on Sarah Ann and Mary Ann Myers.
I hope the following is useful to you. I can find no trace of any of the Myers family in 1861 anywhere, could it be that George Myers was posted say to Ireland or elsewhere at the time of this Census?
It appears there were older siblings also George (Born 1846 Yorkshire), Betsy (Born 1849 Woolwich Kent), Charles Henry (Born 1850 Northampton) and a younger brother John (Born 1859 Alderney).
Betsy Myers married Fred Ridal Q2 1877 Sheffield Yorkshire
John Myers married Kate Eades Q4 1886 Sheffield Yorkshire
Sarah Ann Myers Born 1857 Alderney
1871 Census, Sarah Myers living at Green Hill Daughter's Soldiers Home, Hampstead Middlesex. Her birth place of Alderney confirmed on original transcription.
1881 Census, Sarah Ann Myers was single and a Patient at an Infirmary in Salop Shrewsbury. Her birth place of Alderney confirmed on original transcription
1891 Census back in Alderney as wife to Scottish Born James Burnett, a Lodging House Keeper. No children on this Census (Could not find marriage details), but son James Burnett is boarding in Alderney with the Batiste family at the time of this Census, aged 2 years.
1901 Census in Ecclesall Bierlow Yorkshire as widow Sarah Ann Burnett, a trained Nurse born Alderney.
1901 Census in Middlesex, Son James Burnett aged 11, born Alderney at Royal Masonic School, Wood Green, Middlesex
1911 Census in Rotherham Yorkshire as widow Sarah Ann Burnett, with her son James Murdoch Burnett aged 21, both confirmed born Alderney
*I noticed that a few of the Myers family lived in Ecclesall Bierlow so this added to my belief that this is the right Sarah Myers.
Mary Ann Myers Born 1857 Alderney
1871 Census as mentioned in a prior post, Mary living in Sheffield Yorkshire with the Swindon family
Q4 1878 Mary marries Alonzo Hemsworth in Sheffield District Yorkshire
1881 Census in Ecclesall Bierlow, Yorkshire, Mary and husband Alonzo and daughter Thirza. Her father George Myers a Widower B 1823 in Wath Yorkshire, a Tailor is living with them.
1891 Census in Ecclesall Bierlow Yorkshire with husband Alonzo and children Thirza, Fred, Harry, Mary A, Gertrude, Alonzo and George
1901 Census in Ecclesall Bierlow, Yorkshire with her husband and children Fred, Harry, Mary A, Gertrude, Alonzo, George, Oscar, Constance and Sydney
1911 Census in Ecclessall Bierlow Yorkshire with her husband and children Alonzo, George, Oscar, Constance and Sydney
Hope that helps