Thank you for so much information and hard work as it clarifies a lot
I found recently on Ancestry that I have a second cousin from the Tubbs family so that would suggest to me that Mr Tubbs may also have been the father of my mother Patience born 1907 as well as Arthur who, again on Ancestry, sometimes used the name Tubbs and at others Penfold
According to the 1939 Census there was also another daughter, Kathleen, who was born in 1920 but this would have made her mother Priscilla in her mid 50s when she gave birth to her . So many secrets in the family.