Hi there,
I have been researching the Agnes Keene and Christopher Booker situation too and have some new information for anyone interested.
Agnes was born as Agnes Rebecca Sophia Keene. She married twice, had 1 child from each marriage. However, Agnes did not just have two children, she in fact had three.
As you say, Charles Oliver Booker b.1888 and Winnifred Agnes b.1908, but she had another in 1897. This child was called Amy Laura Keene, born 9 Oct 1897 and she was illegitimate. Her birth certificate says her mother was a domestic servant and her name was Agnes (no middle names). I had to do further research to confirm that Agnes R S Keene was in fact her mother. In the 1901 Census, Amy is a visitor to a family in the Chorlton area. I then searched for any other Keene's in Chorlton in 1901 and Agnes R S Keene was the only other person. I did some further research on roads and dates etc which simply confirmed that they were mother and daughter.
But what I found most interesting was how Amy ended up in a similar situation as her half siblings. In the 1911 Census, Amy is an inmate in one of Dr J M Rhodes Memorial Homes on Canvendish Road.
Apparently, Amy was put into the home because of her father/step-father.
In the 1911 Census, Agnes is living in 4 Thomson Grove, Chorlton, and she is an office cleaner. Her marital status is 'married' and her daughter is living with her. They are also 'boarders' so were not intending to live there for much longer. However, although this may fit into what others have found, the original image says there have been two children born to the marriage and two are still living. This is a complete mystery to me...
I have complete access to the 1911 Census, so if anyone wants details of Christopher's family, then just ask.
I am mostly interested in Agnes and what happened to her and would like to hear from anyone tracing the same line.
Lucy