I don't have you in my records but I do have your James Eldin. If I am correct, your father was the youngest of 21 children of Alfred. The last I have on Howard is that he dissapeared after WW2. I wasn't aware that he had gone to Canada.
Here is the connection to the names that you mention. First, Robertson. Nellie Robertson was the second wife of Alfred Rowlett and the mother of James Eldin. Alfred's first wife, your step grandmother, was Martha J. Carney.
Jemima Owen was married to William Rowlett. Their son, Benjamin Rowlett, and his wife, Rachel Wisehart, were the parents of William Owen Rowlett. William Owen Rowlett and Priann Downs were the parents of Alfred Rowlett.
John Rowlett was the father of the above mentioned Benjamin Rowlett. This John Rowlett was the son of another John Rowlett. The older John Rowlett was the son of William Rowlett and Frances Worsham.
So, Jemima Owen was your third great grandmother. Frances Worsham was your sixth great grandmother.
Your grandfather and my grandfather were first cousins. William Owen Rowlett was the older brother of my great grandfather, Daniel Leon Rowlett. Daniel Leon's oldest son, my grandfather, was William Rudolph Rowlett, born 1858.
If you need more information, just let me know. You may have some information on Alfred's family that I don't have. Well, I do know you have Alfred's family and I don't have that. I have a small amount on some of Alfred's children but not much.