When I was diagnosed with breast cancer in 2013, I remember thinking that if someone in our family had to face this disease, I was glad it was me. Today, it’s not. It’s my precious baby boy. My eight-year-old son, who was five when I was diagnosed, is now facing his own cancer diagnosis.

As a parent, it hurts so much to watch your child face this disease. The treatments can be so hard on the body. But Cameron is a fighter, and...