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Do you know Alice Keathley, she has started a family tree on familysearch.org. family search is a free website, you just need to register to use. Louis Carl Kovach, "Ohio Death Index, 1908-1932, 1938-1944, and 1958-2007" — FamilySearch.org
1920 Census states that Louis and his sister Ida were born in Ohio
Dear Ms. Keathley,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Population Schedules for the 1920 Census, the Population Schedules for the 1930 Census, and the Population Schedules for the 1940 Census in the Records of the Bureau of the Census (Record Group 29) that may contain records of Louis Kovach and Mildred Krzywkowski and their families. Some of these schedules have been digitized in part. The 1940 Census schedules are digitized and available using the Catalog. See NARA’s 1940 Census Records web page for more information. For access to the non-digitized schedules, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
For information about the U.S. Census, see the Census Bureau technical documentation and questionnaires.
You may wish to search Ancestry.com or FamilySearch.org for the U.S. Census. There may be a fee for using Ancestry. Instead, check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
We also located a series titled Naturalization Petitions, 1867 - 9/26/1991 in the Records of District Courts of the United States (Record Group 21) that contains a digitized file unit for Louis Kovach, who was born 16 August 1888 in Miskolc, Hungary and father of a Louis Kovach, who was born 9 December 1915 in Columbus Ohio. The digitized item is available via the Catalog.
We suggest that you request the death certificates for Louis Kovach & Mildred Krzywkowski from the Ohio Department of Health's Bureau of Vital Statistics as well as review the FamilySearch Research wiki for Ohio, United States Genealogy.
We hope this is helpful. Best of luck with your research!