The best we can do on the children of John and Roseanna (McCollum) Bigelow:
16314.451 Samuel, b ca 1821/1822; d 14 March 1828 age 6.
16314.452 Ira, b Abt 1827 LeRoy; d ____ ; m Caroline ______ (b abt ; d 16 March 1851 age 24 and 10 mos.); dau Isadore C. ( b 09 Feb 1851; d 13 Mar 1868); (see below)
16314.453     Hiram, b Abt 1829 LeRoy, NY; d______
; m Clarissa ______ who d 10 Dec 1853 age 20. 
   
 16314.454     Myrum, b Abt   1932 LeRoy; d _____
; 
16314.455     Jerusha, b  1834; d 12 Jan 1841 age 6
years. (Could these be grandchildren?) 
   
 16314.456     Julia, b Abt 1840; d _____ ; 
16314.457 Lucia, b 1842; d 18 Oct 1844 age 2.
Sources: 
 Bigelow Society,The Bigelow Family Genealogy, Vol II, pg 235-236;
 History of Henry County, IL; 
 notes by Bigelow Society historian/genealogist.
Records of Jug Hill or Rice's Hill
cemetery compiled in Tree Talks 1972; 
cemetery is 2 miles from LeRoy, NY
1850 census  New York, Genesee Co., town of Leroy, p. 023:
      John A. Bigelow    age 56   
all born New York
      Mary                          
47
      Hiram                         
21
      Myram                       
19
      Julia                           
10
      Ira                             
23
      Caroline                     
24 (she might be Ira's wife?)