Within the next few years John Kelly married Margaret Gibbons (nee Boyd), who was born in Pennsylvania on December 11, 1809 (date calculated from tombstone inscription).

Margaret was first married to an Irishman named Gibbons.  Their one known child, Margaret Gibbons, was said to be a first cousin to James Cardinal Gibbons of Baltimore, 1834-1921, son of Thomas Gibbons and Bridget Walsh.

The known children of John and Margaret Boyd Gibbons Kelly were probably all born at the Kelly home.  The middle son, John, died as a young man.  Frances Susan married and remained in Hancock County for the rest of her life.  The others left Illinois and located in Appanoose County, Iowa; Mary Jane and Patrick eventually moved to San Antonio, Pasco County, Florida.  This migration path is unusual for former Hancock residents of this era, the overwhelming majority of whom moved in a westerly direction.

i.	Stephen A. Kelly, born August 30, 1843.  He died in Centerville, Iowa, on May 16, 1908.  His burial location is undetermined.
ii.	Mary Jane Kelly, born April 21, 1845, died March 11, 1929, probably in San Antonia, Pasco County, Florida.  Burial at Saint Anthony Cemetery, San Antonio.
iii.	John Kelly, born January 8, 1847 (date calculated from tombstone inscription), and died February 2, 1878.  He was buried at St. Simon Cemetery, near Fountain Green, Hancock County.   Last Will and Testament   Obituary  Public Notices   Tombstone
iv.	Frances Susan Kelly, born March 10, 1849.  She died October 20, 1935, at Carthage, Hancock County, burial at Moss Ridge Cemetery in Carthage.
v.	Patrick Kelly, born about 1851.  He died in May of 1935 in San Antonio, Pasco County, Florida.

John Kelly Sr. died September 19, 1862, probably in or near his home in Hancock Township, and was buried in St. Simon Cemetery in Fountain Green Township.  Family records indicate that John Kelly's middle initial was L.  One cemetery reading states that the inscription on his tombstone reads John R [the rest of the name illegible].  Last Will and Testament   Tombstone

Margaret died October 5, 1876, probably in or near Hancock County.  She, too, was buried in St. Simon Cemetery.  Tombstone

John Kelly, 40, male, farmer, value of real estate 1000, born Ireland, could not read and write
Margaret, 38, female, born PA, could not read and write
Margaret Gibbons, 14, female, born MD, attended school within the year
Stephen Kelly, 7, male, born IL, attended school within the year
Mary J, 5, female, born IL, attended school within the year
John, 3, male, born IL
Frances S, 1, female born IL

John Cillery, 50, male, farmer, value of real estate 3000, value of personal estate 600, born Ireland *
Margaret, 49, female, born PA *
Stephen, 17, male, day laborer, born IL, attended school within the year
Mary J, 15, female, born IL, attended school within the year
John, 13, male, born IL, attended school within the year
Frances, 11, female, born IL, attended school within the year
Pratt, 8, male, born IL, attended school within the year

* For both John and Margaret there's a tally mark in the column for married within the year.  It's an obvious error - but what did the enumerator mean to indicate?  It's a puzzle.

Kelley, Stephen, 25, male, white, farmer, born IL, male citizen of the U.S. aged 21 years or more
Margaret, 59, female, white, keeping house, value of real estate 7000, value of personal estate 2000, born PA
Mary J, 23, female, white, born IL
Fannie, 20, female, white, born IL
John, 22, male, white, farmer, born IL, male citizen of the U.S. aged 21 years or more
Patrick, 18, male, white, born IL