I found the sire in the AMHA online studbook... here is his pedigree....
BLACK HAMMOCKS BOY NAME SIOUX
Pedigree report
05/17/2006
****1***2***3***4***5***6***7***8***9****************************************
| | | | FIELDS LITTLE BOY - UNREG.
| | | DELL TERAS MINUTE MAN - A 05319
| | | |[08/16/1966 : S : SBA : - : - : 30.000]
| | | | FIELDS MOUNTAIN GIRL - UNREG.
| | TAYLORS SMOKEY MAN - A 06155
| | |[04/03/1978 : S : SBK : BD : - : 31.000]
| | | | | | FIELDS LITTLE BOY - UNREG.
| | | | | DELL TERAS FIELDS DELIGHT - A 05320
| | | | | |[04/18/1961 : S : SBS : - : DC : 32.000]
| | | | | | FIELDS KATIE - UNREG.
| | | | DELL TERAS FIRELIGHT - A 05322
| | | | |[04/02/1958 : S : SBA : - : DC : 32.000]
| | | | | DELL TERAS MAGGIE - UNREG.
| | | DELL TERAS LITTLE FLOWER - A 05424
| | | |[06/17/1974 : M : SBK : - : DC : 33.000]
| | | | | DELL TERAS STUNT MAN - UNREG.
| | | | DELL TERAS SUSAN - A 05525
| | | | |[06/19/1976 : M : SCS : - : - : 31.000]
| | | | | DELL TERAS MIDNIGHT - UNREG.
| ARISTAS SHOW TIME - A 12254
| |[06/07/1985 : S : SBK : - : - : 28.000]
| | | | | UNKNOWN - UNREG.
| | | | STOUTS MISTER PRIDE - I 00184
| | | | |[00/00/1963 : S : SSR : - : DC : 30.500]
| | | | | UNKNOWN - UNREG.
| | | DELL TERAS MOON MAN - R 01036P
| | | |[03/03/1967 : S : PCS : - : DC : 31.000]
| | | | | UNKNOWN - UNREG.
| | | | STOUTS MONA LISA - I 01474B
| | | | |[05/10/1966 : M : PCS : - : DC : 32.500]
| | | | | UNKNOWN - UNREG.
| | TAYLORS FOXY LADY - IT02026
| | |[03/01/1981 : M : PCS : - : - : 32.000]
| | | DELL TERAS VICKI I - UNREG.
BLACK HAMMOCKS BOY NAME SIOUX - A 24239
|[04/15/1988 : S : PBK : - : - : 32.000]
| | | | KOMOKOS MR BO JANGLES - UNREG.
| | | KOMOKOS LITTLE CHAMP - R 00311P
| | | |[08/04/1970 : S : PCS : - : DC : 26.500]
| | | | | UNKNOWN - UNREG.
| | | | KOMOKOS SANDY - A 03416
| | | | |[00/00/1967 : M : SBK : - : - : 29.500]
| | | | | UNKNOWN - UNREG.
| | KOMOKOS CANDY MAN - R 02486P
| | |[03/19/1977 : S : SBK : - : - : 24.000]
| | | | UNKNOWN - UNREG.
| | | KOMOKOS CANDY - I 00668
| | | |[05/28/1968 : M : SBK : - : - : 28.500]
| | | | UNKNOWN - UNREG.
| BLACK HAMMOCKS SOXY SIOUX - A 11309
| |[07/13/1985 : M : SBK : - : - : 33.500]
| | | SON OF A BRITCHES - UNREG.
| | BUFFALO CHIP - A 05157
| | |[01/28/1977 : M : PCS : - : - : 34.000]
| | | CINNAMON BUNS - UNREG.
****1***2***3***4***5***6***7***8***9****************************************
Total AMHA Registered Horses: 18
Highest Generation Level (Registered Horses): 5
He is shown here as a black & white pinto - out of two solid blacks. However - as his dam's name was Soxy Sioux - I'll bet she had white socks and maybe other markings and was a minimal pinto. Her dam was a chestnut pinto.
Now, your mare's grandsire from the AMHA studbook...
SCHUESSLER TEDDY BEAR
Pedigree report
05/17/2006
| | UNKNOWN - UNREG.
| HARD TO BELIEVE MR CHAMPAGNE - A 03261
| |[00/00/1978 : S : SCS : - : - : 33.750]
| | UNKNOWN - UNREG.
SCHUESSLER TEDDY BEAR - A 08877
|[12/18/1984 : S : SGR : - : - : 32.750]
| | UNKNOWN - UNREG.
| HARD TO BELIEVE FOXY LADY - A 03258
| |[03/08/1978 : M : SSR : - : - : 33.500]
| | UNKNOWN - UNREG.
He is shown as solid gray - but he can't be. Neither parent is grey. Therefore I'll bet he was silver dapple - and at least one of his parents was a mislabelled silver bay.... and not solid sorrel or solid chestnut.
Grand dam on the same side...
LITTLE BIT FARMS GENESIS
Pedigree report
05/17/2006
****1***2***3***4***5***6***7***8***9****************************************
| | | | | UNKNOWN - UNREG.
| | | | STOUTS MISTER PRIDE - I 00184
| | | | |[00/00/1963 : S : SSR : - : DC : 30.500]
| | | | | UNKNOWN - UNREG.
| | | DELL TERAS MOON MAN - R 01036P
| | | |[03/03/1967 : S : PCS : - : DC : 31.000]
| | | | | UNKNOWN - UNREG.
| | | | STOUTS MONA LISA - I 01474B
| | | | |[05/10/1966 : M : PCS : - : DC : 32.500]
| | | | | UNKNOWN - UNREG.
| | DELL TERAS RED BARON - R 01640P
| | |[05/16/1974 : S : SSR : - : DC : 31.000]
| | | | UNKNOWN - UNREG.
| | | DELL TERAS BARBARA S - R 01049P
| | | |[03/28/1965 : M : RNR : - : - : 34.000]
| | | | UNKNOWN - UNREG.
| SOATS LIL NAVAJO - R 03773T
| |[02/29/1980 : S : PBK : - : DC : 30.500]
| | | LENDERMAN MUSTANG - UNREG.
| | LENDERMAN BUTTERCUP - R 02043P
| | |[08/04/1976 : M : SBK : - : - : 30.000]
| | | | UNKNOWN - UNREG.
| | | LENDERMAN BECKY - R 00412P
| | | |[04/10/1970 : M : PSR : - : - : 34.000]
| | | | UNKNOWN - UNREG.
LITTLE BIT FARMS GENESIS - A 12340
|[03/03/1986 : M : SSR : - : RV : 00.000]
| GINGER - UNREG.
****1***2***3***4***5***6***7***8***9****************************************
Total AMHA Registered Horses: 9
Highest Generation Level (Registered Horses): 4
Does any of that help?