What you need for Family Setup

• An Apple Watch Series 4 or later with cellular, or Apple Watch SE with cellular, with watchOS 7 or later.
• An iPhone 6s or later with iOS 14 or later for the initial watch setup.
• An Apple ID for yourself and one for the family member who will use the Apple Watch. Your Apple ID needs to have two-factor authentication turned on.
• A Family Sharing setup that includes the person who'll use the Apple Watch. You need to have the role of organizer or parent/guardian to set up an Apple Watch for a family member.