No sign of more children or a marriage for the parents that I can see

I see that Christiana was born in 1887 is Lancaster and this is the only William Knowles in 1881 that I can see who was a Hawker However he was already married? Living at Main St Skerton
William Knowles 35 Hawker Scotforth, Lancashire
Anna Knowles 32 Thornton, Lancs
Jane Knowles 13 Accrington, Lancashire
John Knowles 11 Skerton, Lancashire,
Edward Knowles 9 1872 Carlton, Lancashire
Robert Knowles 7 Skerton, Lancashire
Thomas Knowles 4 Isle of Man, Isle of Man
Joseph Knowles 3 Catterall, Lancashire
Ernest Knowles 0 1881 Skerton, Lancashire
Susan H Knowles Niece Married 20 Hawker Ulverston, Lancashire
Kay