Found their marriage records, but no parents are named.
U S Census, 1850 Marshall county, northern division, Marshall, MI
https://familysearch.org/pal:/MM9.1.1/M4L6-77M
John R Hays M 35 TN
Amanda Hays F 29 TN
Joseph M Hays M 12 TN
Susan E Hays F 6 MI
Tennessee A Hays F 4 MI
William M Hays M 2 MI
Tennessee, State Marriage Index, 1780-2002
https://familysearch.org/pal:/MM9.1.1/VN4K-XQS
name: Peggy Amanda Fite
Marriage 22 May 1837
event place: Wilson, Tennessee, United States
gender: Female
spouse: Jno R Hays
https://familysearch.org/pal:/MM9.1.1/XD7M-PFM
groom John R. Hays
bride Peggy Amanda Fits
marriage date: 22 May 1837
marriage place: Wilson,Tennessee
indexing project (batch) number: M51985-9
Other Hays marriages in Wilson, TN same time period, might be siblings – or not?
ttps://familysearch.org/search/records/index#count=20&query=%2Bsurname%3Ahays~%20%2Bbatch_number%3AM51985-9
groom's name: John Earhart
bride's name: Jane Hays
marriage date: 10 Dec 1837
marriage place: Wilson,Tennessee
groom's name: Samuel A. Hays
bride's name: Jane Cloyd
marriage date: 04 Aug 1836
marriage place: Wilson,Tennessee