All’s Y’all = plural
Not quite. It depends on where you're from. Y'all refers to multiple people, but only up to a certain number. Depending on the locale, one prefixes "All" to "Y'all" if there are more than 3 to 5 people being addressed.
"All y'all kids better git yer bikes out the driveway. They's a-fixen to git runned over."
Love it. I also love how daddy is daddy even to strangers. Never my daddy. Just daddy. Daddy loves them buffets a mighty piece.