Have you tried contacting any of the other descendants of
Bishop Parker and Rosa Adams Parker??

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1880 Census - Michigan > Clinton > Bingham > District 43 > 19
William A. Parker 60 born 1820 NewYork NewYork NewYork
Amanda Parker 52 born 1828 Canada NewYork Canada
with these kids -----
William Parker 24 born 1856 NewYork NewYork Canada
Sarah Parker 24 born 1856 Michigan NewYork Canada (daughterinlaw)
George Parker 22 born 1858 Michigan NewYork Canada
Bishop Parker 19 born 1861 Michigan NewYork Canada
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1890 Census
No records available.
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Collection: Michigan Deaths, 1867-1897
Name: Glyn W Parker (male)
Death Date: 06 Jul 1897
Death Place: Bingham, Clinton, Michigan
Death Age: 5 months 1 day
Estimated Birth Date: 1897 in Michigan
Parents are Bishop Parker and Rosie Parker
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1900 Census - Michigan > Clinton > Bingham > District 3 > 6
Bishop S Parker 39 born Sep 1860 Michigan Penn Canada
Rosa M Parker 34 born Jan 1866 Penn Penn Penn
with these kids -----
Fred O Parker 13 born Nov 1886 Michigan Michigan Penn
William S Parker 12 born May 1888 Michigan Michigan Penn
Laura A Parker 10 born Mar 1890 Michigan Michigan Penn
Seth O Parker 8 born Jan 1892 Michigan Michigan Penn
Anson R Parker 6 born Sep 1893 Michigan Michigan Penn
Carl A Parker 1 born Apr 1899 Michigan Michigan Penn
Lucy A Adams 8 born Jun 1891 Michigan Penn Penn (sisterinlaw)
William B Parker 80 born Jan 1820 Penn (father of Bishop)
Census shows Bishop and Rosa have been married for 14 years
Census shows Rosa is the mother of 7 kids with 6 kids living.
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Rose Adams Parker - born Jan 1, 1867 - died Jun 28, 1910
see death cert here - http://seekingmichigan.org/u?/p129401coll7,347808
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Collection: Michigan Marriages, 1868-1925
Marriage Date: 08 Dec 1906
Place: Ovid, Clinton, Michigan
Groom - Fred O. Parker, 21 years, b. 1885 in Clinton Co., Mich
Bride - Edith E. Hier, 18 years, b. 1888 in Clinton Co., Michigan
Groom's parents are Bishop S. Parker and Rose Adams
Bride's parents are George Hier and Mary Boucher
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Collection: Michigan Marriages, 1868-1925
Marriage Date: 09 Sep 1911
Place: Flint, Genesee, Michigan
Groom - William A. Palmer, 24 years, b. 1887 in Howard City, Mich.
Bride - Laura Parker, 21 years, b. 1890 in St Johns, Mich.
Groom's parents are James Palmer and Deborah Brown
Bride's parents are Bishop Parker and Rosa Adams
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Collection: Michigan Marriages, 1868-1925
Marriage Date: 08 Nov 1913
Place: St Johns, Clinton, Michigan
Groom - Seth A. Parker, 21 years, b. 1892 in Clinton Co., Mich
Bride - Florence M. Penix, 19 years, b. 1894 in Clinton Co., Mich
Groom's parents are S.B. Parker and Rose Adams
Bride's parents are Wesley Penix and Lavina Stevens
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Collection: Michigan Marriages, 1868-1925
Marriage Date: 13 Aug 1921
Place: Lansing, Wayne, Michigan
Groom - Carl A. Parker, 22 years, b. 1899 in Michigan
Bride - Gladys D. Palen, 18 years, b. 1903 in Michigan
Groom's parents are Bishop Parker and Rose Adams
Bride's parents are Samuel Palen and Agnes L. Davis
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I hope this information will be helpful to your research.

Susan
Saginaw, Michigan