Are you getting confused with mother Isabella and daughter Isabella? James was a widower in 1881
There is an Isabella Patton death June qtr 1865 Tynemouth as per freebmd. There is an Alexander Paton (one T) birth registered December qtr 1865 Tynemouth which does not link date wise to the death
The 1857 marriage is the only one in Northumberland for a James Patton with an Isabella on the same page.
I have also searched using Patten and Paton just in case but nothing matches to an Isabella
IGNORE the above.