Hello, Ward3736,
This is a surorise,
1901 census
RG13/714 folio 132
Gravesend & Milton Union workhouse.
John Charles Johnson Mar. age 45 clerk in Shipping House
born Hackney, London
John Herbert son age 7 b, Islington
Edith May dau age 5 b ditto
Ivy dau age 3 b South Hampstead
Gladys dau age 1 b Lewisham
Elsie Mary dau age 1 mth. b Gravesend.
The only birth I checked was Elsie Mary as she was only imth old, I thought it was the easiest.
Born mar ¼ 1901 Gravesend 2a 604
I could not find anything yet for Ruth, the obvious guess would be that she died when Elsie was born but I cannot find a death for her at that time.
I wonder if your mother's memory was a little adrift re the Theatre fire, dates can become very confused in memory.
If you obtained Elsie Mary's birth certificate this would be a great help, this can be done online at
www.gro.gov.uk/gro/content/certificate/index.asp#0good luck
Meliora