Hello,
I have the following details for 4 girls with the surname Kinchin present at the Dorset Home in Poole in 1921:
- Elizabeth Kinchin, 14 years, 10 months old
- Ella Kinchin, 12 years, 3 months old.
- Florrie Kinchin, 9 years 10 months old
- Lily Kinchin, 7 years, 10 months old.
All four girls have their place of birth listed as London, and the census taken has noted that their mother is dead. I don't know how that lines up with the information you already have?
The Dorset Home was sometimes known as the Dorset Home for Girls or the Dorset Industrial School. It was located at 32-33 West Street Poole, and it opened in 1865 and closed some time in the mid 1930s. Girls were usually sent for a period of time, or until they reached a certain age. At the point in time when the Kinchins were there children of WW1 servicemen could be sent to an Industrial School if they had no other means of support. I hope this is helpful for you, if you're still looking.