Bertha may have been name after her Auntie Bertha Boardman,
who was born in Bolton in 1888,
Bertha is with her Dad Edward in 1901 living in the home of her married sister Maria Greenhalgh,
the 1891 census isn't the easiest to read, but you can make out , father Edward born Liverpool, mother Mary born Harrington, Maria 14 born Winscales Cumberland, Marg E AGED 12 born Salford,Beatrice aged 3 born Bolton using the GRO for these births Maria Boardman mother Marshall J 1877 Cockermouth, Margaret Ellen Boardman mother Marshall Salford M 1879,
1881 Census family are in Salford