Trees on Ancestry have this as Ada's family in 1901:
Class: RG13; Piece: 3417; Folio: 145; Page: 27
21 Orphan Street, Liverpool
Knowles, Henry P Head M 56 Coach Painter b Bristol, Somerset
Knowles, Susan B Wife F 41 b London
Knowles, Percy P Son M 14 Telegraph Messenger b London
Knowles, Ada Daughter F 8 b Liverpool
And John's family, also 1901:
Class: RG13; Piece: 3527; Folio: 58; Page: 56
21 Elephant Lane, St Helen's, Lancashire
Williams, Richard Head M 40 Coal Hewer b Caernarfon
Williams, Sydna Wife F 39 b Festiniog, Merionethshire
Williams, David Son M 17 Pony Driver, Coal Mine b Festiniog
Williams, George Son M 16 Shop Assistant (Grocer) b Haydock, Lancashire
Williams, Martha Daughter F 13 b Haydock
Williams, John Son M 10 b Haydock
Williams, Hannah J Daughter F 8 b Haydock