Thanks for stopping by the Apple Support Communities. If I understand your post, you've noticed that pictures you take on your iPhone are appearing on your son's iPad, which you would like to stop. I'm happy to help!
It sounds like you may be using the same Apple ID on both your iPhone, and your son's iPad, in iCloud. If that is the case, it's likely you have iCloud Photo Library enabled, which syncs your pictures across all devices using that Apple ID: Set up and use iCloud Photos - Apple Support.
Thanks for stopping by the Apple Support Communities. If I understand your post, you've noticed that pictures you take on your iPhone are appearing on your son's iPad, which you would like to stop. I'm happy to help!
It sounds like you may be using the same Apple ID on both your iPhone, and your son's iPad, in iCloud. If that is the case, it's likely you have iCloud Photo Library enabled, which syncs your pictures across all devices using that Apple ID: Set up and use iCloud Photos - Apple Support.