Brennan Donnelly is the older brother of Flippin' Katie, a popular figure on Instagram who is also featured on his sister's YouTube channel. Brennan has garnered a significant following on his own, with over 290,000 followers on his brennanmdonnelly Instagram account. His first appearance on his sister's channel was in the video "Family Obstacle Course Challenge" in May 2015. Brennan began playing water polo at the age of nine and has since competed in prestigious events such as the Junior Olympics, the ODP National Tournament, and international competitions in Canada.

Career & Family Life

In addition to his athletic achievements, Brennan is also a member of the National Junior Honor Society, showcasing his dedication to both academics and sports. He has a younger brother known as Flippin' Ryan, and their parents are Jill and Mike Donnelly. Brennan's multifaceted talents and supportive family environment have contributed to his growing popularity and success.