You didn't provide any timeframe. Depending on your age - your grandfather may have been born between 1870-1970! It also helps if you include names of spouses - such as your grandmother - which helps with b, m, d records.
The results below may be the correct family. Charles Jacob Wirtz son of Jacob Wirtz and Cora Bennett. More records can be found using the free search tool at: https://familysearch.org/search
Indiana, Marriages, 1811-1959
Citing this Record: "Indiana, Marriages, 1811-1959," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/27VB-SMG
Name: Charles Jacob Wirts
Marriage 29 May 1927 Wayne, IN
Registration Place: Wayne, IN
Marriage License Date: 28 May 1927
Residence Place: Richmond, Indiana
Male Age (Est): 31 White 1st Marriage
Birth 21 May 1896 Birthplace: New Paris, , OH
Father Jacob C Wirts b. Greenville, OH
Mother Cora R Bennett b. New Paris, OH
Spouse Edith Young
Residence Place: Richmond, , Indiana
Female Age (Est) 22 White 1st Marriage
Birth: 28 May 1905 Birthplace: , , Kentucky
Father Grant Young b. KY
Mother Myra Bryant b. KY
Officiator's Name: Edwin K Lumpkin
Page: 172
SOURCE IMAGE AT: https://familysearch.org/pal:/MM9.3.1/TH-1951-31693-6627-57?cc=1410397&wc=M944-391:n1235884390
Ohio, County Births, 1841-2003
Citing this Record: "Ohio, Births and Christenings, 1821-1962," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XX7P-C7X
Name: Jacob Wirts (possibly Jacob?)
Birth 10 Jan 1871 Jackson, Preble, Ohio
Father Adam Wirts
Mother Sarah E. Snodgrass
Ohio, Deaths, 1908-1953
SOURCE IMAGE: https://familysearch.org/pal:/MM9.3.1/TH-1951-21757-55066-49?cc=1307272&wc=M9SV-5Q4:118024167
Name: Cora R Wirts
Death 03 Dec 1943 Lanier, Preble, Ohio
Burial Dec. 6, 1943 Springlawn Cemetery , New Paris, OH
Female Age: 67 yrs. 12 days Widow
Birth Nov. 21, 1876 New Paris, OH
Father Isaac Bennett Birth Cambridge City, IN
Mother Ethel Marshall Birth Cambridge City, IN
Spouse Jacob C. Wirts
More records on Jacob and Cora;
https://familysearch.org/search/record/results#count=20&query=%2Bgivenname%3Ajacob%20%2Bsurname%3Awirtz~%20%2Bbirth_place%3Aoh~%20%2Bbirth_year%3A1870-1872~%20%2Bresidence_place%3Ain~%20%2Bspouse_givenname%3Acora~
US Census 1930 Richmond, Wayne, IN
Head Charles J Wirts M 33 OH
Wife Edith F Wirts F 24 KY
Son Norman Wirts M 1 IN
Bro-in-law Kenneth A Young M 17 KY