How to Add Multiple Accounts to Your Amazon Echo - Lifehacker

But what if multiple members of your household have separate accounts, and all of you want to get notifications or make Prime purchases using the same Echo?

Connecting multiple adult accounts (with separate logins) authorizes both users to make purchases with their own linked payment methods.

Note that teens ages 13–17 with linked Household accounts can make purchases using their own logins with approval from adult account managers.