Aged only 21, Baltimore Orioles star Jackson Holliday is one of the most exciting talents in the big leagues at the moment. Jackson Holliday's little sister, Gracyn, is also quite athletically gifted, and is currently a cheerleader for Stillwater High School. Gracyn Holliday captioned her Instagram postScreenshot of Gracyn Holliday's Instagram Story (Image from - Instagram.com/@gracynholliday IG Stories)Both Jackson and Ethan Holliday are also alumnus of Stillwater High School, graduating in 2022 and 2025 respectively. AdJackson Holliday's sister, Gracyn, has often shown she is her brother's biggest fanOn several occasions, Jackson Holliday has talked about the important role his dad, Matt, played in helping him hone his skills. Screenshots of Gracyn Holliday's Instagram Story Highlights (Images from - Instagram.com/@gracynholliday IG Story Highlights)Unfortunately for Jackson Holliday and others of a Baltimore Orioles persuasion, 2025 was quite a tough season.