Hi Ravenhair!
Just stumbled across this in my own research, and I'm glad I did!
I'm the 2x great grandson of Ellen Dixon (1876-1955) and John Henry Simpson (1878-1913). My great grandmother was Hilda May Simpson (1905-1990).
I can't find a record of Ellen and John's marriage but I think it was around 1898. They are living together as man and wife in 1901 (in Friskney), along with Albert and two other children who you are not aware of, Rose Lillian (1898-1980) and Elizabeth Ellen (b.1900). They also had another daughter, Beatrice (1902-1986) before Hilda, Henry (1908-1993) and George (1911-1991) came along.
According to the 1911 census, the family were living in Frampton, although Albert and Elizabeth are not living with them. Ellen is recorded as "Helen". The census also says that they have been married 17 years, which is clearly not the case - but may hint that John was the father of Albert.
John Henry Simpson was tragically killed by a train in 1913. Ellen went on to marry again - to William Meeds in 1923. They then relocated to Kettering, where she passed away in 1955. Henry and George moved there with her, but were frequent visitors back to Boston when I was a child. I remember Uncle Henry very well. Both my grandmother and aunt Beatrice remained in Boston, both settling in Wyberton - where I still reside.
Hope that fills in a few blanks for you. Feel free to get in touch for any more info.