Family Calendar and Reminders do not show up on family's devices

I've set up Family Sharing with myself as the family organizer. I can see the Family Calendar and Reminders on all of my devices (Macbook, iPad, iPhone), but the other person in my family is unable to see these on his iPhone 5S. All of the shared content seems to be working fine across all devices, but he is unable to see or access the Family Calendar and the Family Reminders list. We have tried restarting all devices with no result. Does anyone know what the problem could be?