Why We Exist
For every kid who's spent their weekend on folding chairs, eating snacks from the bottom of mom’s bag, and watching another game that isn’t theirs — welcome to your moment.
The Sideline Sibling is a playful apparel and accessories shop made just for you: the brothers and sisters cheering (or reluctantly tagging along) from field to field, game after game. We see you. And we think you deserve more than just a granola bar.
Get to Know Me
My name is Ethan, and I am 8 years old. My brother, Alex, is 11 years old, and he plays a variety of competitive sports, so I spend a LOT of time watching him play (and to be honest, it can get boring).
Learn more about me and why I started The Sideline Sibling (with the help of my parents, of course).
What We Sell
Tees, Game Day Accessories, and a Whole Lot of Sideline Sass
Our hilarious tees and sideline-worthy gear are designed to make every Sideline Sibling in the family feel like a superstar. Whether you’re snacking, sketching, or pretending to watch the game, we’ve got your style covered.
Parents, we haven't forgotten about you - we're working on a collection of shirts and accessories just for you! Check back again soon.
Our Purpose
(And It's Bigger Than Us)
We believe youth sports build more than athletes — they build community.
That’s why 50% of all profits are donated to underprivledged nonprofit youth sports leagues across the U.S., helping more kids play, grow, and shine. So when you shop with us, you’re cheering on more than just your siblings — you’re supporting future players and future memories.
SUGGEST A SHIRT - GET IT FREE!
HELP US HELP YOU!
We are always trying to come up with the coolest, funniest, and awesomest shirt and apparel ideas. But we can't do it alone!
Drop your suggestions in the form, and if we pick your slogan or idea, we will send you a shirt for FREE!
So put your thinking caps on and get creative!
The Sidelines Just Got More Fun