Or do you only have the 1877 teapot as evidence of marriage?
because my theory is all based on a 1872 marriage
I can't see any 1877 marriages in Wigan area for John Young to a Betty or Elizabeth.
Could the teapot be a 5 year commemorative item?
And where does the steeplejack info come into the story?
Milly

PS - Just seen a tree on Ancestry that has Betty and the 1872 marriage and all the other info including Joshua (except that has two Joshuas instead of one)... And there are a couple of others too.
One says that Betty Lysons father died when she was a baby and her mother remarried to Atherton...with Betty appearing as either Lyson or Atherton in various census..... Are any of these trees yours?
None of them have the two Joshua's actually being the same person - but it looks very likely to me