Never married. No known children. US, IL, Schuyler Co, Rushville - 1930 Census, shows Richard living with his mother Emma Katherina Wankel-Kuechler, her age 79, his age 56. House number 345, with Emma listed as the head of the household. Buried adjacent to his parents: Edward Ernest Kuechler and Emma Katherina Wankel-Kuechler.
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"US CENSUS 1880"
Name: Richard Kuechler
Event Type: Census
Event Date: 1880
Event Place: Arenzville, Cass, Illinois, United States
Gender: Male
Age: 6
Marital Status: Single
Race: White
Race (Original): W
Occupation: At School
Relationship to Head of Household: Son
Relationship to Head of Household (Original): Son
Birth Year (Estimated): 1874
Birthplace: Illinois, United States
Father's Birthplace: Germany
Mother's Birthplace: Illinois, United States
Sheet Letter: D
Sheet Number: 752
Person Number: 3
Volume: 1
Household
Role
Sex
Age
Birthplace
Edward E Kuechler Self M 37 Germany
Emma Kuechler Wife F 27 Illinois, USA
Charles E Kuechler Son M 7 Illinois, USA
Richard Kuechler Son M 6 Illinois, USA
Rudolph Kuechler Son M 4 Illinois, USA

SOURCE: US Federal Census, 1880
Source [link]: https://www.familysearch.org/ark:/61903/1:1:MXNW-RDV
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"US CENSUS 1930"
Name: Richard P Kuechler
Event Type: Census
Event Date: 1930
Event Place: Rushville, Schuyler, Illinois, United States
Gender: Male
Age: 56
Marital Status: Single
Race: White
Race (Original): White
Relationship to Head of Household: Son
Relationship to Head of Household (Original): Son
Birth Year (Estimated): 1874
Birthplace: Illinois
Father's Birthplace: Germany
Mother's Birthplace: Illinois
Sheet Letter: B
Sheet Number: 3
Household
Role
Sex
Age
Birthplace
Emma Kuechler Head F 79 Illinois
Richard P Kuechler

SOURCE: US Federal Census, 1930
Source [link]: https://www.familysearch.org/ark:/61903/1:1:X3MF-QYD