Detailed dates for George and Margaret, as well as Margaret's parents, courtesy of Kathryn Mercedes
Cooley Miller's Book Miller Emme Ancestry.

For source of children names see Artifact of 1880 Census under George W. Miller's individual record.

1850 Census - Armstrong County, Pennsylvania
Sugar Creek

  279 279
  Geo W. Miller    25 M Laborer  Pa
  Margaret         19 F          Pa
  Philip            1 M          Pa
  Abraham Davison  20 M Laborer  NJ
  Thomas D. Buzard 16 M  "       Pa

From Vance Funeral Home records (974.884 V3m):

Mary Ellen Miller single
9-12-1857 9-25-1950
Father: George Mother: Margaret Buzzard
Hopwood Pa.

1860 Census, Fayette COunty, Pennsylvania
Georges TWP - 18 July 1860

1403 1399
Geo. W. Miller  35 M Day Laborer 600 Pa
  Margaret      29 F                 Pa
  Phillip       11 M                 Pa
  Eliz.          9 F                 Pa
  Margaret J.    5 F                 Va
  Mary E.        3 F                 Va
  Amelia A.   5/12 F                 Pa

1404 1400
Elwood Gaskill......

1870 Census, Fayette County, PA - Georges TWP
20 July 1870

    428 432
    Miller, George    46 M W Farmer 12128 308 Penn
        Margaret      39 F W Keeping House    Penn
        Philip        21 M W Farm Lab         Penn md Jan
        Sarah         24 F W Keeping House    Penn
        Elizabeth     19 F W                  Penn
        Margaret      15 F W                  Penn
        Mary          13 F W                  Penn
        Samuel        10 M W                  Penn
        Henry          6 M W                  Penn
        David          3 M W                  Penn
        Priscilla      1 F W                  Penn

1880 Census, Fayette County, PA - Georges TWP

    47 48
    Miller, Margaret  W F 49 Mother   Keeping House  PA
      Lizzie          W F 29 Daughter                PA
      Samuel          W M 18 Son                     PA
      David           W M 13 Son                     PA
      Henry           W M 16 Son                     PA
      Percilla        W F 11 Daughter                PA
      Margaret        W F 25 Daughter                PA
      Mary            W F 21 Daughter                PA
      Anna            W F  8 Daughter                PA
      Charley         W M  1/6 Born in March Son     PA
      Edith           W F  3 Daughter                PA

[Given the ages of the children, there is a conflict between that and the death date of George W.
Miller (1876), which I have not verified independently - DGB]

1884 - Elizabeth Miller Obituary

  Miss Elizabeth MILLER died in 1884. Her obit was contributed to the Fayette County USGenWeb
Project.(3)

  MILLER, MISS ELIZABETH
  HAYDENTOWN
  Miss Elizabeth MILLER, daughter of the widow MILLER, died at the residence of Mr. Philip MILLER,
her brother, at Wood’s tamery , on Sunday, December 7, 1884.  Deceased was buried on
Monday at the MILLER graveyard nearby. 
Standard  Thurs.  12-11-1884 pg. 1  col. 7

From Vance Brownfield Funeral Home Records by Kathryn Cooley Miller

    1892 Jul 29 Heirs Geo Miller for Widow

1900 Census - Fayette County, PA - Georges TWP
ED 25 - 20 June 1900

  244 251
  Miller, Philip G.  Head W M June 1849 50 M 30 Penn Penn Penn Coke Drawer
  Sarah A.           Wife W F Nov  1846 54 M 30 0 0 Penn N.J. Penn
  Gaskill, Elwood    Fath W M Mar  1817 83 W 62 N.J. N.J. N.J.
  Evans, Jella       Niec W F Feb  1888 12 S    Penn W.V. Penn

  251 258
  Miller, David A.   Head W M Dec  1866 33 M    Penn Penn Penn Lumberman
  ---, Mary E.       Sist W F Sept 1857 42 S    Penn Penn Penn Weaver
  ---, Persilia      Sist W F Jan  1869 31 S    Penn Penn Penn
  ---, Thomas A.     Bro  W M May  1872 28 S    Penn Penn Penn Stone Mason
  ---, Charles R.    Bro  W M Mar  1880 20 S    Penn Penn Penn Teamster
  ---, Dora E.       Sist W F Apr  1884 16 S    Penn Penn Penn