Alexandra. You won't find both Robina & John Herbert on the same census as they were taken every 10 years so the actual years the 2 could have been in the same family home isn't covered on a census. 1901 Robina was 18 & in service & 1891 John was not born.
Yes Robina did marry - James Kelly in 1914. They were my mother's parents. It was a wartime wedding so both Robina & her 'maid of honour' who was her sister Bessie, both wore suits.
Ann's son William Arthur (william the lamplighter I think he was nicknamed) md Elizabeth Kewley in Malew Church in 1904 & they had at least 6 children. I know Mona the next youngest born 1917 is still alive. Auntie Bessie md Robert (Bob) Kelly but I don't know if they md in Liverpool. Their only son was born in 1926. They had a dog called Gyp.