Hi again, How delightful that you are creating a family history book. I've made several and the family seem to treasure them.
So here's a summary of what I see so far.
Using the 1880 census as a starting point, with information added from Find-a-Grave (and not independently verified):
The Find-a-Grave poster would be a good contact for you, if you have not already met. Lots of great photos for your book!!
Samuel M. Stoufer
Born 20 OCTOBER 1826
DIED 16 FEB 1908
He married twice according to a Genforum post (I have NOT verified this).
Buried at Limestone Church of God Cemetery, Adrian, Armstrong, Pennsylvania.
born 1828. Lived in Washington Township/Franklin Township in Armstrong County, Pennsylvania, in 1850 census and 1880 census. His mother's name was Mary (born about 1784). Father unknown.
Samuel first married Sarah NN born about 1828.
NOTE: I DO NOT KNOW IF THIS MARRIAGE IS CORRECT. I see a Samuel and Catherine Stouffer in the 1850 census in Armstrong County, Pennsylvania (with infant son Isaiah), but if this marriage is correct, then that would have to be another Samuel and Catherine Stouffer!
THEIR 4 CHILDREN: 1. Mary 2. James 3. Barbara 4. Madison
More about these 4 CHILDREN
1. MARY J. STOUFFER born 1850 died 1887, appr. age 37. Buried in Limestone Church of God Cemetery, Adrian, PA Her gravestone has her birth name of Stouffer, so most likely she never married.
2. JAMES H. STOUFFER
Born 28 MAY 1853
Died 12 JAN 1930 Cowansville, Armstrong, PA
Obituary: James H. Stouffer aged and well known resident of Cowansville died at the home of his son, Sharon, of Cowansville, on Sunday evening at 9 o'clock. Deceased was aged 76 years, 9 months and 15 days and is survived by one son, Sharon, of Cowansville, and one daughter, Mrs. Clarence Snyder, of Cowansville; four brothers, M.M. of Ulysses, Neb.; W.W. of Natrona Heights; S.M., of Kittanning; and H.C., of French's Corners; also seven grandchildren and one great-grandchild. Source: Simpson Leader-Times, Kittanning, PA, 13 JAN 1930, Page 4 [Sharon Samuel Stouffer also died in Armstrong County, PA; one of his descendants has posted on Genforum in Stouffer Family forum.]
3. Barbara born 1855
4. Madison Meredith Stouffer
Born 01 JAN 1859 Armstrong County, PA
Died 05 DEC 1942 in Litchfield, Sherman, Nebraska
Obituary: Madison M. Stouffer died at the home of his son Clarence in Holbrook Neb., Dec. 7 1942, aged 84 yrs. His wife and several children died some years ago. She was Julie Lemmon. He is survived by 3 sons, Robert, Clarence & John all out in Nebraska. They moved to Neb. in 1909; they used to live above Limestone Church of God in Reesdale. From: The journals of Rebecca Fair, Book 1. Meredith Stouffer and Julia Rebecca Lemmon (Feb. 28, 1865-Apr. 3, 1922) had four children: Robert Alexander Stouffer (1882-1969), Clarence Lucius Stouffer (1884-1945), John Roy Stouffer (1887-1977, and William Harvey Stouffer (1892-1930)
Samuel next married Catherine Schall
Catherine born 05 MAR 1833
Died 10 AUG 1907
Buried at Limestone Church of God Cemetery in Adrian, PA
THEIR 5 CHILDREN: 5. William 6. Samuel 7. Henry 8. Annie 9. Isaiah
More about these 4 CHILDREN:
5.William born 03 DEC 1861 in Adrian, PA died May 25, 1941 in Natrona Heights, Allegheny, PA
Obituary: William W. Stouffer, 79, died at his home at 1018 Poplar street, Natrona Heights, Sunday, May 25, 1941 at 8:45 p.m. He is survived by five daughters; Mrs. Edward Porter and Mrs. Harry Wolfe, Natrona Heights; Mrs. Ray Solida, Tarentum; Mrs. Frank Miller, Mercersburg; and Mrs. Fred Shea, Tarentum; three sons, Harry J. Stouffer and Chester Stouffer Tarentum, Paul Stouffer, Freeport; 19 grandchildren and seven great-grandchildren; and three brothers; Madison Stouffer, Litchfield, Nebraska; Samuel Stouffer, Kittanning; and Henry Stouffer, Adrian. Buried Limestone Church of God Cemetery in Adrian.
6. Samuel M. Stouffer
Married Cora A. Zellefrow
Buried Limestone Church of God Cemetery, Adrian, PA.
Obituary for Cora: Mrs. Cora A. Stouffer, widow of Samuel Stouffer, died at 8:10 p.m. Tuesday April 8, 1958, in her Kittanning RD 5 home. She was aged 88 years, having been born on Feb. 1, 1879, a daughter of Chambers and Rachel (Davis) Zellefrow. Survivors are two sons, Emmitt Stouffer of Kittanning RD 5 and Roscoe Stouffer of Ecorse, Mich.; a sister, Mrs. Lina Wolfe of Adrian; 24 grandchildren and a number of great grandchildren. Mrs. Stouffer was a member of the Kittanning First Baptist Church.
7. Henry C. Stouffer
Born 05 SEP 1866 Armstrong County, PA
DIED 13 JUL 1945 Kittanning, Armstrong, PA
Married Sarah Ann Lasher September 15, 1888 in Armstrong County, Pennsylvania
Henry and Sarah’s children: Harry G. Stouffer (1888-1906) and Ora Alma Stouffer Toy (1891-1944)
Obituary: Henry C. Stouffer, aged 78 years, of Adrian, RD 1, died at 7:45 o'clock on Friday morning, July 13, 1945, in the Armstrong County Hospital. Mr. Stouffer was a retired carpenter. Only survivors are several grandchildren and a number of nieces and nephews. Friends will be received in the home of his son-in-law, James Toy, in Adrian. Buried Limestone Church of God Cemetery, Adrian. From: the Simpson Leader-Times, Kittanning, Pennsylvania
8. Annie C. Stouffer (May 30, 1868-Oct. 18, 1872)
Buried Limestone Church of God Cemetery, Adrian, PA
9. Isaiah M. Stouffer
Born SEP 1870 Armstrong County, PA
Died 12 SEP 1918, Pittsburgh, Allegheny, PA
Married Mary Rebecca Myers (1877-1939)
Obituary: Isaiah M. Stouffer. The above well known citizen of McGrann died at the West Penn Hospital Pittsburgh, Thursday night at 7:30 o'clock. He had not been in good health but had returned to work. Last Monday he was attacked with sudden illness and was taken to the hospital Wednesday afternoon and his death so soon came as a great shock. He was aged 48 years and 2 days. The body was brought home Thursday night on the midnight express. His wife and two children, James, aged 10 and Ruby, aged 6 years, survive him, also six brothers, J.H., and M.M., of Nebraska; W.W., of Brick Church; S.M., of Garrett's Run; H.B., of French's Corners. Funeral services will be held at the home Saturday evening at 8 o'clock and at one o'clock Sunday afternoon the funeral cortege will leave the house for the Limestone Hill Church of God near Montgomeryville where services will also be held and the interment will take place. From: the Simpson Leader-Times, Kittanning, Pennsylvania, Friday, September 13, 1918