It looks like Richard was born 1877.

1881 census in Liverpool at 174 Wavertree Road:-

Robert Knowles 23 Railway Porter, Whiston ( on the outside of Liverpool)
Mary A. 23 wife
Richard R. 4 Liverpool
Margaret A 2
John C. 10 weeks

Then came Harry 1885 and Thomas H.V. 1887

They were still at the same place in 1901.

Robert married Mary Downes at St Cleopas Toxteth Park Liverpool 1875

Len Faragher