I am not directly related to your family. It was a bit difficult for me to fully understand everything you are saying in your query due to lack of punctuation but I think I have figured out a few things that will help you. Perhaps with this information you will be able to learn more.
I will begin with the latest census available which is the 1930 Harlan Co. and work backwards:
1930 Harlan Co. Fed. Census
Dist #9 - Frozen Prec.
MIDDLETON, William, 57, mar. at 20 yrs, b. KY
. .Polly Ann, wife, 56, mar. at 19 yrs, b. KY
SEXTON, Edith, dau, 25, mar. at 19 yrs, b. KY
. .Hazel, "says grandaughter - not dau., age 6, b. KY * *
. .Mable, granddau, 4 yrs, 0 mos', b. KY
. . Elmo??, grandson, 2 yrs, 2 mos, b. KY
If I have understand you correctly that Hazel SEXTON was your mother, then it appears to me that Edith was a MIDDLETON and the dau. of William and Polly Ann BROWNING MIDDLETON.
From the KY Birth Index, there is also this sibling who was not yet born at the time of the 1930 Harlan Co.
SEXTON, John M. b. 8-22-1930, Vol. 075, Cert 37076, maiden name of mother: Edith MIDDLETON
Going backwards to the 1920, this same family looked as follows:
MIDDLETON, William, 45, b. kY; parents b. KY - miner
. .Polly, wife, 45, b. KY; parents b. KY
. .Emma, dau, 25, b. KY
. .Marsis, dau, 19, b. KY (assume this is Narcissus)
. .Edith, dau, 15, b. KY
. .Pearl, son, 13, b. KY
. .Hester, dau, 10, b. KY
. .Earl, son, 9 mo's, b. KY
Going backwards to 1910:
1910 Harlan Co.
Yocum's Creek, District #2
MIDDLETON, William T., 38, mar. 1, mar. 18 yrs, b. KY; parents b. KY
. .Polly Ann, wife, 37, mar. 1, mar. 18 yrs, 8 born; 5 living, b. KY; parents b. KY
. .Emily J., dau, 16, single, b. KY
. .Narcissus, dau, 9, b. KY
. .Edith, dau, 5, b. KY
. .Pearl, son, 3, b. KY
. .Margaret H., dau, 3 mo's, b. KY
1900 Harlan Co.
MIDDLETON, N. M., age 26, b. Jan. 1873
. .Polly A., 24, b. Nov 1875
. .Emily J., 6, b. June 1893
NOTE: I do not know why the initials N. M. are used. They are living next dwelling to:
MIDDLETON, Robby, 34, b. May 1866, (s/o William T. and Narcissus HOWARD MIDDLETON)
. .Elizabeth, 24, b. Jan. 1875 (d/o Wilson and Ingabo NOE BROWNING)
. .Wilson, 7, b. Jan 1892
. .Margie, 4, b. Oct 1895
. .Jacob, 4, b. Feb. 1897
. .James, 1, b. Sept 1898
. .Belva, b. Feb. 1900
I do hope you will be able to use this information to connect your family back further. I can tell you that as of the 1880 Harlan Co. there are NO Polly Ann BROWNINGS showing up.
There are however, more than one Mary BROWNINGS and Mary and Polly are often used interchangeably so my guess is that your Polly Ann is one of the Mary's shown. I just don't know which one because they are close in ages and the ages are rarely ever exactly correct.
Joyce Taylor Collins
La Palma, CA