I searched the 1871 census on Ancestry and think I've found the right entry for Mary Ann Bertie and 4 of her children Mary Ann, Elizabeth, Margaret and James living at 9 Shore Wynd, Montrose. The names fit, but the ages don't all make sense - eg Margaret Bertie is listed as a scholar aged 40 when my Margaret Bertie should be 10!
However, this is from the transcribed entry. Is it possible that a mistake was made in transcribing the original? Does anyone have access to the original to do a lookup to check?
Many thanks for your help
Charlotte