Amanda Sibert, also called Maddie, was born in McDonough County, Illinois.  She was the daughter of John Sibert and Anna Catherina Kube.  The Siberts apparently lived for a short time in McDonough County, then relocated to Fountain Green Township in adjacent Hancock County, where Amanda would spend the rest of her life.

The date of birth inscribed on her tombstone is May 11, 1857, but most records suggest she was born in 1856, including an obituary.  If she was born in 1856, she was a twin to Fanny, who died in infancy.  If Amanda was born in 1857, then she and Fanny were born exactly one year apart.  As outrageous as we might consider it, there are a number of examples of incorrect dates on tombstones for people documented on this website.

Joseph and Amanda were married on March 30, 1876, by Rev. Thomas M. Walker. Marriage License

They farmed and raised their family in Fountain Green Township.  We presume all of the children were born there.

Joseph survived Amanda by 12 years, died in Macomb, McDonough County, on April 25, 1930.  Both he and Sadie were buried at Fountain Green Cemetery, where their shared tombstone also marks the resting place of their daughter, Margaret.

Joseph and Amanda's children were:

i.	Lillie S. Dunn, born about 1876.  She died as a child, sometime after June 1, 1880, burial location not determined.
ii.	Sarah E. Dunn, known as Sadie, born February 9, 1878, died April 1, 1914, in LaHarpe, Hancock County.  She was buried at LaHarpe City Cemetery.  Her husband was the James W. Andrews mentioned in Amanda's obituary.
iii.	Margaret M. Dunn, born January 18, 1880, died March 9, 1901.  Buried at Fountain Green Cemetery.
iv.	John Henry Dunn, born January 31, 1885.  He died after April 1, 1930.  John's first wife and a son are buried at Fountain Green Cemetery.
v.	William Ernest Dunn, born June 28, 1886, died after April 1, 1930.
vi.	James Clinton Dunn, born September 12, 1888, died after April 1, 1930.
vii.	George Wesley Dunn, born October 8, 1895.  He died after April 1, 1930.

John Sibert, 44, male, farmer, value of real estate 4000, value of personal estate 1000, born PA
Catherine, 40, female, born PA
John, 20, male, farmer, born PA
Elizabeth, 18, female, born PA
Gabert, 13, male, born PA
Christiana, 12, female, born PA
Jane, 6, female, born PA
Elizabeth, 4, female, born PA
Mary, 4, female, born IL  [Amanda]
Sarah, 1, female, born IL

Sibert, John Sr, 53, male, white, farmer, born Hesse Cassell, both parents foreign born, male citizen of the U.S. aged 21 years or more
Catherine, 50, female, white, keeping house, value of real estate 7500, value of personal estate 1000, born Hesse Cassell, both parents foreign born [There's a mark next to the ages of John and Catherine which is probably meant to indicate that the real estate and personal property values should be shown on the line for John Sr.]
Gabriel, 24, male, white, farmer, value of personal estate 100, born VA, both parents foreign born, male citizen of the U.S. aged 21 years or more
Mary J, 17, female, white, born OH, both parents foreign born, attended school within the year
Betsie A, 13, female, white, born IL, both parents foreign born, attended school within the year
Amanda, 13, female, white, born IL, both parents foreign born, attended school within the year
Sarah, 10, female, white, born IL, both parents foreign born, attended school within the year

Dunn, Joe, white, male, 26, married, farmer, born PA, both parents born PA
Amanda, white, female, 24, wife, married, keeping house, born IL, both parents born Hessen Cassel
Lily S, white, female, 4, daughter, single, at home, born IL, father born PA, mother born IL
Sarah E, white, female, 1, daughter, single, at home, born IL, father born PA, mother born IL

Dun, Joseph H, head, white, male, Nov 1855, 44, married for 24 years, born PA, both parents born PA, farmhand, months not employed - 0, could read, write and speak English, owner, [final entries scratched out]

Maddie, wife, white, female, May 1856, 44 [looks more like 49], married for 24 years [looks more like 29]; mother of 8 children, 7 living; born IL, both parents born VA, could read, write and speak English

Saddie L, daughter, white, female, Feb 1878, 21, single, born IL, father born PA, mother born IL, hired girl, months not employed - 3, could read, write and speak English

Maggie M, daughter, white, female, Aug 1881, 18, single, born IL, father born PA, mother born IL, non gainful, could read, write and speak English

Johnie H, son, white, male, Jan or Jun 1884, 16, single, born IL, father born PA, mother born IL, at school for 7 months, could read, write and speak English

William E, son, white, male, Jun 1886, 13, single, born IL, father born PA, mother born IL, at school for 8 months, could read, write and speak English

James C, son, white, male, Sept 1888, 11, single, born IL, father born PA, mother born IL, at school for 8 months, could read, write and speak English

Dunn, Joseph H, head, male, white, 57, married (1st) for 34 years, born PA, both parents born PA, spoke English, farmer, general farm, working on own account, could read and write, rented his farm home, farm schedule 79

Amanda, wife, female, white, 54 ?, married (1st) for 34 years; mother of 7 children, 5 living; born IL, both parents born Germany, spoke English, could read and write

James C, son, male, white, 21, single, born IL, father born PA, mother born IL, spoke English, laborer, home farm, employee, whether out of work on April 15, 1910 - no, number of weeks out of work during 1909 - 0, could read and write

George W, son, male, white, 15, single, born IL, father born PA, mother born IL, spoke English, could read and write, attended school after Sept. 1, 1909

Dunn, Joe, head, renter, male, white, 65, widower, could read and write, born PA, father born PA; mother born England, native tongue English; spoke English, farmer, general farm, working on own account, farm schedule 129

Clint, son, male, white, 31, single, could read and write, born IL, father born PA, mother born IL, spoke English, farmer, home farm

Harley, grand son, male, white, 14, single, attended school after Sept. 1, 1919, could read and write, born IL, both parents born IL, spoke English

Dunn, Clinton J, head, renter, [no entry for monthly rental], owned a radio, lived on a farm, male, white, 42, married, age at first marriage - 31, could read and write, born IL, father born PA, mother born IL, spoke English, farmer, general farm, whether a veteran of the U.S. military or naval forces mobilized for any war or expedition - no, farm schedule 120

Helen R, wife, female, white, 28, married, age at first marriage - 18, could read and write, born IA, both parents born IL, spoke English

Dale, son, male, white, 8, single, attended school after Sept. 1, 1929, born IL, father born IL, mother born IA

Betty, daughter, female, white, 6, single, attended school after Sept. 1, 1929, born IL, father born IL, mother born IA

Lillie, daughter, female, white, 3 10/12, single, born IL, father born IL, mother born IA

Donald, son, male, white, 10/12, single, born IL, father born IL, mother born IA

Joseph, father, male, white, 75, widower, age at first marriage - 22, could read and write, born PA, father born Germany, mother born Ireland, spoke English, whether a veteran of the U.S. military or naval forces mobilized for any war or expedition - no