The following material on the immediate ancestry of G. Gordon Liddy should not be considered either exhaustive or authoritative, but rather as a first draft.  
 
 
 
 
 

1930 New York, Kings Co., Brooklyn, ED 79, Sheet 16A, line 9

                                                    Father's       Mother's
                   Rel  Age  Status  Birthplace     Birthplace     Birthplace 
Liddy Sylvester J   H   30   M  30   New York       New York       New York
      Maria A       W   21   M  21   West Virginia  Pennsylvania   D C

Sylvester was a Lawyer, Law Office

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1920 District of Columbia, Washington, ED 270, sheet 7B, line 85
     1910 Calvert Street

Abbaticchio Raymond J      H     M W 37 M    PA Italy Italy     1st Lieutenant    U S Army
            Ada A          W     F W 36 M    DC DC    PA
            Raymond J Jr   S     M W 12 S    DC PA    DC
            Maria L        D     F W 11 S    WV PA    DC
            Ada P          D     F W  7 S    DC PA    DC
Alexander Paul F           BiL   M W 39 S    MD DC    PA        Manager           Lithograph Office
          May L            SiL   F W 42 S    DC DC    PA        Stenographer      Red Cross Office
     (one servant)

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1900 Pennsylvania, Westmorland Co., Latrobe, ED 106, sheet 2A, line 33

Abbatticchio Arcangelo   H  W M Jan 1842 58 M 32        Italy Italy Italy    1875 25 Na    Proprietor of Hotel
             Mary        W  W F Aug 1842 57 M 32 4 ..   Italy Italy Italy    1875 25
             Albert      S  W M Mch 1870 30 S           Italy Italy Italy    1875 25 Na    Hotel Clerk
             Caroline    D  W F Aug 1878 21 S           PA    PA    PA
             William     S  W M Jun 1880 19 S           PA    PA    PA                     Shipping Clerk
             Raymond     S  W M Jun 1882 17 S           PA    PA    PA                     At School
     (one boarder)
     (three servants)

The birthplaces don't make much sense, but that's what the schedule says.

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1900 District of Columbia, Washington, ED 25, sheet 16B, line 52
     1647 30th Street NE

Alexander Rebecca      H     W F May 1826 74 Wd   6 4    VA Mura[sic] VA     Land Lord
Russell Fannie         D     W F Jan 1850 50 Wd   3 3    DC VA        VA
Alexander Louise       DiL   W F Apr 1854 46 Wd   7 7    PA PA        PA
          May          GD    W F May 1878 22 S           DC DC        PA
          James        GS    W M Jan 1879 21 S           DC DC        PA     Reporter
          Paul         GS    W M Apr 1882 18 S           DC DC        PA     At School
          Ada          GD    W F May 1884 16 S           DC DC        PA     At School
          Josephine    GD    W F Jul 1886 14 S           DC DC        PA     At School
          Frank        GS    W M Apr 1888 12 S           DC DC        PA     At School
          Florance     GD    W F May 1892  8 S           DC DC        PA     At School
     (three servants)

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1880 Maryland, Prince George's Co., Vansville, ED 120, page 17, line 37

Smith Josephine R     W F 48            Farming              PA France PA
      George          W M 16    S                            MD
      Borden J        W M 11    S                            PA
      Thomas B        W M 11    S                            PA
      Harry W         W M  7    S                            PA
Alexander Fendall     W M 29    SiL     Attorney ay Law      DC VA     VA
          Louisa      W F 27    W       Keeping House        DC
          Mary L      W F  3    D                            DC
          James E     W M  1    S                            MD
     (one farm laborer, two servants)

For the most part the enumerator left blank the columns for the birthplaces of the parents.

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1880 District of Columbia, Washington, ED 55, page 19, line 8
     1007 F Street NW

Alexander Columbus    W M 59           Retired Printer    VA VA VA
          Rebecca     W F 50    W      Keeping House      VA DC VA
Hay Sarah             W F 79    MiL    At Home            VA MD MD
     (three servants)

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1870 District of Columbia, Washington, page 167, line 19

Alexander Columbus     54 M W    Printer                  150000   5000    VA
          Rebecca      43 F W    Keeps House                               VA
          Columbus S   24 M W    Mercantile Clerk                          DC
Russell Frank C        22 F W    At Home                                   DC
Alexander Walter O     21 M W    Physician                                 DC
          Henry        20 M W    Lawyer                                    DC
          Fendal E     18 M W    Law Student                               DC
          Douglass B   16 M W    Apprentice Engineer                       DC
Russell Francis        28 M W    Clerk Gas Co                              Canada
        Lula            1 F W                                              DC
     (four servants)

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1860 District of Columbia, Washington, page 35 (mechanically numbered page 451), line 8

Columbus Alexander      40 M      Printer      100,000     25000       VA
Rebecca Alexander       31 F                                           VA
Franceline Alexander    18 F                                           DC
Columbus Alexander      15 M                                           DC
Walter Alexander        14 M                                           DC
Henry Alexander         11 M                                           DC
Fendall Alexander        9 M                                           DC
Douglass Alexander       7 M                                           DC
     (three servants)

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1850 District of Columbia, Washington, Dwelling 331

Columbus Alexander      34      M      Printer      7000       DC
Rebeca Alexander        26      F                              DC
Frances Alexander       10      F                              DC
Columbus Alexander       7      M                              DC
Walter Alexander         5      M                              DC
Henry Alexander          3      M                              DC
Fendall Alexander          7/12 M                              DC
Chas Schell             20      M      Printer                 DC
John Johnson            16      M      Printer                 MD
J Q Adams               16      M      Printer                 MD
Theophalis Moore        17      M      Printer                 MD

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1850 District of Columbia, Washington, Dwelling 506

Henry Hay              54 M   Painter             Mass
Sarah  "               50 F                       DC
Rebecca Alexander      30 F                       "
Virginia Hay           23 F                       "
Thomas   "             14 M                       "
Bushrod Corbin          7 M                       "
George Vamill          18 M   Painter             "

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    Baldwin Dade (number 114)
    Baldwin Dade (number 228)
    Capt. John West (number 230)

While Mr. Liddy is not eligible for membership in the NSDAR (by not being female), he is eligible for membership in the equivalent organization for men, the National Society of the Sons of the American Revolution.