Just been reading the Cruddas/ Crewdis/Carruthers posts & empathise with you all but wonder if you have come across that name in the Whitby area in the 1800s?
My Gt grandmother, Elizabeth Cruddas, swore that she was 'blood Scotch', gave her place of birth as Glasgow but lived around Whitby all of her apparently non-married life & is proving a total mystery.
Having read of your non census recorded relatives, I'm wondering if they perhaps travelled to Scotland, had a daughter & returned to England with her.
Just a thought.
Good luck with the search x
