This could be them on the 1901 Census
RG13/1324 F 50 P 20
Waterside, Kings Langley (District of Hemel Hempstead)
Jane Smith age 28 b Boxmoor, Hertfordshire Widow Head
David J Smith age 2 b Luton, Bedfordshire Son
Edith M Smith age 1 b Kings Langley, Hertfordshire Daughter
George Smith age 22 b Great Gaddesden, Hertfordshire Brother in Law
Hopr this helps
Robert