John Pyatt was born c1775-1795 to Moses Pyatt & ? in Ohio and died in March 1850 in Kendall County, Illinois. He married on July 31, 1803, in Fairfield County, Ohio, to Marguerite Elder who was born c1785 in Ohio (the Ohio part is in question) and who died in June of 1850 in Kendall County, Illinois. Since their deaths were so close together in a year when a mortality schedule was prepared, we get to see both their entries in the 1850 Illinois Mortality Schedule as follows:
Pyatte, John N male/born OH/age 54/March/Cause of death not given
Pyatte, Margaret female/born OH/age 65/June/Palsy
John's age would indicate he was born c1796 while Marguerite's that she was born c1785. It was fairly uncommon for her to have been older and since his age is not compatible with their year of marriage and the birth of their childen, his mortality schedule information might be in error. Perhaps we was 64 instead of 54 years old. He should have been born about 1780 to have married in 1803.
I suspect John was in Kendall County, Illinois by 1834 (in Kendall Township) because his son, John, was listed on the pioneer index of Kendall County as having arrived in that year. Of interest is that the family of Samuel and Mary Phelps Pyatt came to that County at the same time and lived in the same township. Samuel was born in 1793 in Ohio to Ebenezer and Rebecca Milburn Pyatt. The family however was enumerated in Perry County, Illinois, on both the 1830 and 1840 census. I don't see where Perry and Kendall counties were ever part of each other to explain this apparent appearance between two census enumerations. I haven't seen anyone connect these two families yet.
The known children of John and Marguerite were:
Moses Pyatt b: 1804 OH d: 24 Jun 1866 LaGrange Co, IN m: c1828 Elizabeth Parker b: c1802 NJ d: 9 May 1866 (probably LaGrange Co, IN)
Mary "Polly" Pyatt b: 1806 OH m: c1829 Francis "Frank" Evans
Sarah "Sallie" Pyatt b: 1808 OH (unmarried)
Cynthia Pyatt b: 1804-1810 m: 21 Oct 1830 Huron Co, OH, Robert Evans
William "Bill" Pyatt (Capt) b: 1810-1820 [did he marry Charity McLerary/McCrary 04/21/1842 Kendall Co, IL?]
John Pyatt b: 21 Jun 1816 OH d: 16 Aug 1861 Morris, Grundy Co, IL (buried Evergreen Cemetery, Block 8, lot 114) m: 12 May 1842 (or 05/26/1842) Kendall Co, IL Cynthia Mizner (d/o Lewis and Lucy Posey Mizner) b: 24 Apr 1825 Shelby Co, IL (or IN?) d: 13 Apr 1874 (or 13 Sep 1874) Morris, Grundy Co, IL (buried Claypool Cemetery, Grundy Co, IL (removed to Evergreen Cemetery, Grundy Co, IL))
Martha Pyatt b: 29 Nov 1843 near Millbrook, Kendall Co, IL d: 1 Jan 1915 Morris, Grundy Co, IL m: 5 Oct 1862 Grundy Co, IL, Moses James
Lewis Cass Pyatt b: 24 Jun 1848 near Milltown, Kendall Co, IL d: 28 Jan 1890 Blair, NE m: 7 Feb 1875 Grundy Co, IL, Amelia Mary Bargo b: 22 Feb 1856 Channahon, IL d: 4 May 1888 Buffalo Gap, Dakota or Blair, NE?
Ruth E Pyatt b: 17 Apr 1851 near Milltown, Kendall Co, IL d: 24 Mar 1942 Morris, Grundy Co, IL m: 5 Mar 1871 Bates Co, MO, William Byron Holderman
Abigail "Abbie" Pyatt b: 1802-1804 m: William "Bill" Hill
Samuel Pyatt b: 1802-1804 [or c1820] d: 16 Feb 1870 KS m: 12 May 1842 (or 06/02/1842) Pavilion, Kendall Co, IL, Sinah W Misner b: 13 Jan 1823 Indiana d: aft 1880 [last found Poe, Ringold Co., IA 1880]
Serilda Pyatt b: aft 1820 m: c1849 Thomas Norman [is she the early teacher in Hollenback School in Kendall County, Illinois?]
Marguerite Pyatt b: 1826 d: 26 Feb 1863 (buried Claypoole Cemetery, south of Morris, Grundy Co, IL) m: 12 May 1844 Kendall Co, IL, Elisha James
I found references to E. B. James at History of Grundy County, Illinois (published 1914) that may refer to Elisha James who married Marguerite Pyatt. One reference for an early church included mention of John Platt.
I found John Pyatt Jr on the 1850 census of Kendall Township, Kendall County, Illinois, as follows: