Brilliant, I do believe you've cracked it - that John's a spinner, too.
I've been looking for these guys for years!
It took me ages to find, even with the reference you gave - Ancestry has them transcribed as Schafred. I'd tried a load of wildcard searches in the past, but evidently not the right one.
I hadn't found any siblings for Mary Ann, either, so the ones you've found may lead to more information
Thanks very much