General Notes

In 1881, Mary Greenhalgh (6) was with her parents and sisters Hannah (3) and Frances (1).

In 1891, Mary Greenhalgh (16) was with her family and 4 sisters at Tonge.

In 1901, Mary Greenhalgh (26) was with her family and 4 sisters at Tonge (NE Bolton).

In 1911, Mary was not with the family, so it is likely she married (aged over 36) or died.

Between 1811 and 1821, 22 Mary Greenhalgh's married at Bolton, 5 of whom were simply "Mary" and 3 at Bolton Registry office are possible (spouse CUNLIFFE,  ANDERSON and HOWARTH).  However, non of these three Marys match up wiith the 1921 census.

There is no matching death or 1921 census for Mary, so perhaps she married at Bury or Elsewhere.