The Nintendo Switch Online Family Membership is a special tier of the Nintendo Switch Online service. Nintendo Family Plans allow up to eight Nintendo Account holders to play Nintendo Switch games online.
How to Set Up a Nintendo Switch Online Family Membership
The person who sets up the family plan is responsible for paying the annual subscription fee and adding and removing other accounts. To create a Nintendo Switch family plan and add members to the group:
Go to the Nintendo Switch Online membership page in any web browser.
Scroll down to Family Membership and select Purchases.