You didn't give any dates, so Im not sure I found the right Robert Kuhn, but here goes.
Robert Thomas Kuhn filled out a draft registration card for World War I on 5 June 1917: He was born in Rosedale, Mississippi on 15 November 1889. He was a married farmer living at Jericho, Mississippi.He had no dependents under 12 years of age.He was caucasian, tall, stout, brown eyes, light brown hair.The draft registration card is here: https://familysearch.org/pal:/MM9.3.1/TH-1951-25092-43566-73?cc=1968530
In 1900, he and several siblings were living with an aunt and uncle at ED 152 Dover Township (south half) Higginsville city (part) Ward 3 (part), Lafayette, Missouri: Household Gender Age Birthplace HeadS W FreandeauM 54 GermanyJan 1846 married 32 years WifeJohanah FreandeauF 51 SwitzerlandOctober 1849 mother of 8 children, 4 still living DaughterKattie A FreandeauF 21 IowaFebruary 1879 SonWalter F FreandeauM 11 MissouriAugust 1889 NieceFannie F KuhnF 17 MississippiJune 1883 NieceEmma B KuhnF 15 MississippiDecember 1885 NephewRobert T KuhnM 11 MississippiNov 1889, father born Switzerland, mother born Pennsylvania NieceKattie KuhnF 8 MississippiJan 1892 The 1900 census record is here: https://familysearch.org/pal:/MM9.1.1/M3ZX-4P7
A Robert Kuhn shows up married in the 1930 census of Jasper, Crittenden, Arkansas: Household Gender Age Birthplace HeadRobert KuhnM 40 Mississippifather born Switzerland, mother born Mississippi WifeMary KuhnF 35 Arkansas DaughterMarybeth KuhnF 12 Arkansas DaughterVesta KuhnF 10 Arkansas DaughterDorothy KuhnF 8 Arkansas DaughterBarbara KuhnF 7 Arkansas NephewRobert K FloydM 19 Mississippi CookCharlene BrooksF 22 Arkansas The record is here: https://familysearch.org/pal:/MM9.1.1/XM2R-PMJ
The same family, minus the oldest daughter, who I presume has married and moved out, in the 1940 census of Marion, Jasper Township, Crittenden, Arkansas: Household Gender Age Birthplace HeadRobert T KuhnM 50 Mississippioccupation=farmer WifeMary K KuhnF 45 Arkansas DaughterVesta KuhnF 20 Arkansasoccupation=bookkeeper DaughterDorothy KuhnF 19 Arkansas DaughterBarbara KuhnF 17 Arkansas 1940 census here: https://familysearch.org/pal:/MM9.1.1/KQVF-7SY
In the 1880 census of Rosedale,? Bolivar,? Mississippi, there were three Kuhns: Household Gender Age Birthplace SELFJno. T. KuhnM 30 Switzerland WIFEEmma KuhnF 20 Pennsylvania, United States DAUBurder KuhnF 3M Mississippi, United States The census record is here: https://familysearch.org/pal:/MM9.1.1/M4GM-D71