Broderick and Parker's son turned 18 on Oct. 28, just days before Election Day. The actress penned a touching note in honor of her son's big milestone on social media.
"I marvel at the passing of those years but equally the young man you are becoming. My love for you is an ache and an honor. As you leap toward and into your future, I remain your privileged and steadfast confident and joyful witness to the year ahead," she added. "Happy birthday my first time voter. I love you so. X, Mama."