We only have cellular phones in our home and with our older phones my wife and I could add TouchIDs to each of our phones, and add our children's fingerprints as well. So, anyone could quickly use either phone. It's not just a matter of convenience, but also if there is an urgent matter... perhaps not a 911 emergency, but an emergency none the less, our children can quickly use the phones to get help.
Anyhow, with our new iPhone X, I cannot find how to train it to open for more than one face. How can we add FaceID for family members to our iPhones now?