Father-in-law Day – This day is to honor your spouses father, your father-in-law. #FatherInLawDay
My wife Heather calls her in-laws by in-loves. When you get married, the father of your spouse is your father-in-law (father-in-love). This day is held annually on July 30. I couldn’t find out when or how this day got started.

So Happy Father-in-Law Day to my Father-in-Love, Tim!
(Learn more about the term -In-Loves instead of In-Laws)
First published July 30, 2018. Last updated or republished July 29, 2019.