Possessive form of Y'ALL

[RonButters at AOL.COM]

I have never heard anyithing but Y'ALL's (as in the example). Most young
white people in this area are relatively r-ful, but they never say *YOUR ALL
or *YOUR ALL'S -- any more than YUZ speakers say *YOUR YUZ'S.

In a message dated 5/23/2001 12:25:51 PM, flanigan at OAK.CATS.OHIOU.EDU writes:

<< For plural
possessive, would you/you all say "your all's" or "you all's"?  Granted, if
one is r-less, the production would sound like "y'all's" (as below).  But
if you're r-ful (as many Southerners and most South Midlanders are), would
you say "your all's," i.e., is there an underlying /r/ which may or may not
be pronounced?  An Athens County student of mine insists that she said
"your all's" both as a child in Mississippi and as an adolescent and adult
in southern Ohio. >>