Family History Case Study: Martin family history

This is a follow-up post to one we did back in November. Below is what amounts to a family group sheet for Perry Newton Martin and Mary Olive Keltner. As you can see, family history research is always a work in progress!

Perry Newton and Mary Olive Keltner Martin 
Family Group Information

Husband
Full Name: Perry Newton Martin
Born: 13 November 1875, Indiana, USA
Married: 8 April 1895, Montgomery County, Indiana, USA
Died: 26 July 1956, Champaign County, Illinois, USA
Buried: East Lawn Cemetery, Urbana, Champaign, Illinois, USA
Occupation: Locomotive Engineer, Illinois Central Railroad, retired 1946
Church: University Place Christian Church, Urbana, Champign, Illinois, USA
Father's name: Valerian I. Martin (1851-1931)
Mother's name: Mary Jane Corn (1850-1928)

Wife
Full Name: Mary Olive Keltner
Born: 23 September 1875, Darke County, Ohio, USA
Died: 11 May 1965, Champaign County, Illinois, USA
Buried: East Lawn Cemetery, Urbana, Champaign, Illinois, USA
Occupation: Telephone Operator
Father's name: Jacob M. Keltner (1810-?)
Mother's name: Margurete Cain (1845-?)

Children

1. Arthur Martin
Born: May 1896, Indiana, USA

2. Harry Ellsworth Martin
Born: 6 January 1898, Crawfordsville, Montgomery, Indiana, USA
Married: Thelma Clotine Sayles (26 Jun 1906 - 27 Jan 1973) on 27 June 1924, Rantoul, Champaign,   Illinois, USA
Died: 26 June 1972, Urbana, Champaign, Illinois, USA
Buried: Woodlawn Cemetery, Urbana, Champaign, Illinois, USA
Occupation: Brakeman, Driver, Warehouse manager
Church: University Place Christian Church, Urbana, Champaign, Illinois, USA

3. Lee Otis Martin
Born: 1900, Montgomery County, Indiana, USA
Died: before 1965

4. Thelma Madeline Martin
Born: 20 April 1906
Married: Donald Oliver Sturdyvin
Other marriages: John B. Hughes, 13 May 1946, Champaign County, Illinois, USA


5. Ernest Walter Martin
Born: 1912
Died: before 1965