The Photos app recognizes groups of people and pets who often appear together in pictures and videos, and sorts them into group collections. For example, if you have many pictures of your family or group of friends, Photos creates a collection for each of those groups.
You can create a group with any combination of people and pets from the People & Pets collection.
Go to the Photos app on your iPad.
Tap People & Pets in the sidebar.
Touch and hold a group, then drag it to a new position.