As for other family members I don't know again. I heard he was estranged from his family.
BucksExile
If he was born in Salford, then could this be the family 1901?
14 Broster street Salford
Thomas Butterworth 39 Iron foundry worker born Salford
Mary A Butterworth 32 born Manchester
Frances Butterworth 6 born Salford
Louisa Butterworth 5 born Salford
James Butterworth 3 born Manchester
John Butterworth 2 Months born Salford
RG13; Piece: 3730; Folio: 48; Page: 15.