Hi Sandra,
Was Sarah married before to John Hendry, or do I have the wrong person? This looks like Sarah and Annie in the 1901 census, with the same birthplaces as they had in 1891:
1901
10 Coatfield Lane, Leith, Midlothian
Isabella Jeffrey, 54, Head, born S Leith, Midlothian
James Graham, 28, Son, born S Leith, Midlothian, Rivetter
John Graham, 21, Son, born S Leith, Midlothian, Cooper
Thomas Graham, 19, Son, born S Leith, Midlothian, Gen Labourer
Barbara Milton, 14, Boarder, born N Leith, Midlothian, Scholar
Catherine Muir, 13, Daughter, born So Leith, Midlothian, Scholar
John Hendry, 24, Boarder, born Burkie, Forfar, Engineers Labourer
Sarah Hendry, 19, Boarder, born Dalkeith, Midlothian
Annie Clarke, 17, Visitor, born Penicuik, Midlothian
And here's the rest of the family in 1901, with the addition of two more daughters, so more siblings for you to trace!
44 Glencraig Cottages, Auchterderran, Fife
Willm Clarke, 46, Head, born England, Coal Miner
Catherine Clarke, 38, Wife, born Dalkeith, Midlothian, Coal Miner's wife
Willm Clarke,, 14, Son, born Penicuik, Midlothian, Coal MIner
Lizzie Clarke, 11, Daur, born Uphall, Linlithgowshire, Scholar
Catherine Clarke, 9, Daur, born Penicuik, Midlothian, Scholar
Jessie Clarke, 4, Daur, born Penicuik, Midlothian
John Clarke, 22, Nephew, born Lasswade, Midlothian, Coal Miner
Edward McFarlane, 31, Boarder, born Lasswade, Midlothian, Coal Miner
All the best,
Sarah