Every month, I get dozens of messages on Instagram from parents, grandparents, and caregivers who’ve just heard the words “agenesis of the corpus callosum (ACC)” for the first time. Some are moms still pregnant, scared about what’s ahead. Others are grandparents wanting to know what life might look like for their grandchild.
This is our story—not because it’s the only story, but because it’s ours. My daughter, Lillie, is seven, and she was born with ACC. Around here, we call it her “race car brain”—because it works differently, but it’s powerful, fast, and uniquely hers.
The Ripple Effect
Parenting a child with a race car brain doesn’t just affect that child—it ripples through the whole family. We’ve learned that what happens with Lillie doesn’t stay with Lillie. It impacts her brother, our marriage, our routines, and even the way we plan vacations.
On the outside, it can look like we’re just a “normal” family with two kids who are 20 months apart. But behind the scenes, the way we manage life is different because of her diagnosis. And that difference isn’t always easy.
The Brother Effect
Lillie’s brother often takes the hardest hits—sometimes literally.
When her pitcher is empty after school, he’s the first target. A random punch in the minivan as they buckle up. A mean comment thrown his way. He hasn’t done anything, but he’s there, and she needs somewhere to spill her frustration.
He’s old enough to notice the double standard. He sees that she doesn’t always have to finish cleaning her room because she’s “overwhelmed,” while he doesn’t get the same pass. He notices when she refuses to apologize and gets away with it because we’ve already fought a bigger battle that day. He feels the sting of her calling him names, even when we try to repair it later.
And as parents, it breaks our hearts. We want to protect both of them. But the truth is, sometimes protecting her means he absorbs the fallout.
The Family Pace
Our family life runs at Lillie’s pace, whether we want it to or not.
We can’t change activities at the last minute unless her pitcher is full. If we do, we pay for it later in meltdowns and chaos. That means spontaneity is rare. Weekend outings require careful planning and frequent breaks. Vacations? Parenting in a different location.
Her brother feels this too. He wants to go, do, and keep moving. But often, he’s stuck waiting while Lillie resets, or while we regroup from a meltdown. For him, it feels boring and unfair. For us, it feels like constantly balancing two kids with very different needs.
The Exhaustion
The impact isn’t just on the kids. It’s on us as parents too.
We’re more tired than we expected to be at this stage. Because when she doesn’t sleep, we don’t sleep. When she spirals at night, we carry that with us the next day. There are more appointments to schedule, more workdays missed, more mental load juggling therapies, IEP meetings, and doctor updates.
Some days, the exhaustion feels like it’s stitched into the fabric of our family. And other days, it feels like we’re just like everyone else—laughing at the dinner table, watching a movie, biking down the street together. Both are true.
The Cost and the Gift
This is what it means when I say “the rubber hits the road.” The diagnosis isn’t just Lillie’s—it’s all of ours. It shapes her brother’s childhood, our marriage, and the way we live our lives.
But it also gives us something unexpected: perspective. We’ve learned patience in ways we never wanted to, but desperately needed. We’ve learned to celebrate small wins, like a meltdown that lasted 20 minutes instead of 90. We’ve learned to value structure, routine, and grace.
It’s not easy. Some days, it’s downright exhausting. But it’s also ours.
If you’re new here because ACC has become part of your story, welcome. You’re not alone.
I’ve written more about our life with ACC—the joys, the struggles, and everything in between. You can find all of those posts here.
Because a race car brain doesn’t mean a broken brain—it means a different kind of magic. ✨
