Hello and thank you so much for replying to my post.
Yes, Harriet was his 2nd wife (marriage took place after they were living together). We did get the marriage cert, but it didn't give us much to work on, other than birthplace Vienna.
What puzzles me is:
1) Why I can't find any record of JB senior's death (as Harriet was listed as widow in 1901)?
2) Why wasn't JB junior on the earlier census (presumably in Vienna until some time between 1891 and 1901?
3) I often wonder why JB senior came to the UK and when? Would he have spoken English (given that he was living/married to Harriet - English)?
So many questions and I don't seem to be getting anywhere finding any answers! :)