In ohio there is a 3 day in lieu of jail program usually for first time offenders however my father is elderly and it has been over 12 years
How many total DUI convictions does he have? Were any of his priors felonies? There is a cheat sheet for these made you can see here: https://www.ghmc.org/sites/default/files/pdfs/ovichart.pdf
The short answer is that he likely eligible again for a DIP program. But, keep in mind that is a minimum punishment. The judge can impose much more severe sanctions even on a first time lifetime offender. His history may cause the judge to not even consider the DIP option even if he is technically eligible.