Hey Sandie!
I have to be honest, having hit a brick wall in 2007 (and changing computers and losing all my computerised information) I moved on to other branches of the family and put 2 lever-arch folders worth of Ghosts into the cupboard. It was only after stumbling onto this site last night and doing the search of all my names (as you do) that I've reserected this lot.
Just prior to your post I was sitting here going through the paper files and was reading my page on William and Sophia (as i have her), but blow me if I can find my way back to it 15 minutes on!
Because I have concentrated my efforts on Henry's son Thomas who married Margaret Tippett, and their descendants, I don't have much other than what's been found on common census' etc for the other siblings.
I do have William and Sophia marrying in 1878 Bethnal Green and the birth of their daughter Emma in 1879 Limehouse.
But nothing further.
I've got Henry & Jemima's daughter Elizabeth marrying an Alfred King (is this the Elizabeth you were referring to?) and not Sophia's brother. But as I said, I haven't done a lot with these.
You can't confirm that Henry's parents were Richard and Mary, can you?
I'll leave it there for the moment, but have lots of bits and pieces if you are interested.

SG