However, National Siblings Day was founded in the U.S. in 1995 by Claudia Evart, who created the day after losing her brother and sister at a very early age, per National Today.

Inside: Some of the most wacky and fun holidays to celebrate in 2025. Along with holidays for almost every day of the year. Did you know there are fun and wacky holidays to celebrate almost every ...

However, National Siblings Day was founded in the U.S. in 1995 by Claudia Evart, who created the day after losing her brother and sister at a very early age, per National Today.