I've being trying to work out the connection between the George and Charlotte Field (marriage witnesses) to Rose Field and despite him being George Francis rather than George Henry I think he has to be her brother.
There doesn't appear to be a George Francis who it could be and when he marries Charlotte Walker (1910) his father appears to be listed as Thomas. Not sure if other details match.
Also in 1921 Mary Ann Field (mother) appears to be a boarder of Arthur Walker, Charlotte's brother, and they are living at 5 back 141 St Vincent's Street, the address given on Rose's marriage.
Why George Henry became George Francis I don't know.