Thank you everyone, especially Jonw65. This information is what I have been searching for a long time.
Especially interesting is that Elizabeth Ann's second husband George Sharp lived at 62 St Paul's Road, Islington, between 1904 and 1912. This address is where Elizabeth Ann's sister Rebecca lived, with her second husband Harry Thompson, sometimes her daughter Beatrice and family, and I think her son Herbert. Rebecca lived at 62 St Paul's Road on the 1901 and 1911 censuses and at her death in 1923; 1891 Rebecca was at Baxter Road with Harry (then a lodger), and children Beatrice and Herbert.
Maybe I should have twigged from the other people living with Rebecca's family on the 1911 census. I had assumed it was an overcrowded lodging house, but maybe Rebecca owned it, and everyone there was family.
I never did manage to find any will or probate from Rebecca's first husband Samuel Alexander Park, or any money trail proving that he was indeed the father of her children Beatrice and Herbert. Rebecca and Samuel married in 1884, and within months he was at sea again, as a Master Mariner. To know how she was managing to pay her rent and feed her children would be informative. Maybe Samuel left her enough to buy her house, or maybe her sister Elizabeth bought her house for her? Samuel died 4th June 1894 of "Internal disease believed to be ruptured spleen", at sea, aboard the ship Wing Sang, probably while it was stopping at Singapore.
