When I was younger, my dad used to drive drunk with me and my sisters in the car. He didn't just drive drunk, but he would drink while driving. I was the oldest. I wished for the courage to tell my dad that me and my sisters weren't going to get in the car if he'd been drinking. Unfortunately, as a child, I was too scared. I wished that someone would catch him, that someone would notice him swirving and call the cops.
You did the right thing calling CPS. You are protecting people who lack the ability and resources to protect themselves. Children need adults to keep them safe. Good job.