Does anyone know how to track someone location on iPhone free?

Hey everyone, I’m trying to figure out if there’s a reliable way to keep tabs on a family member’s iPhone location without spending money. I know there are paid apps out there, but I’m hoping for a free solution. Has anyone had success with built-in features or other free methods?

Find My app is free and built-in, but it requires consent and setup on the other device. There’s no legitimate way to track without the other person’s cooperation.