If multiple people in your home have Amazon accounts, you can add them to your Alexa household profile. To check which profile is currently being used, simply ask, "Alexa, which profile is this?" And to switch profiles, say, "Alexa, switch profiles." While adding additional members doesn't give you separate shopping or to-do lists, it does allow you to share content libraries. Beware, though, as it also allows them to use your Prime account to order items.