^Interesting info regarding the Amish, Quakers, and Mennonites. I wondered if it might be one (or all) of those to whom you were referring -- thanks for sharing! I have some Quaker friends, but they speak in typical American English -- at least around me.
As to y'all
and all y'all, y'all
is for addressing a small group of people and all y'all
is for addressing a large group of people!