http://www.techradar.com/news/amazon-will-soon-let-third-party-developers-create-multi-user-alexa-skills

Amazon rolled out software that makes it easy for its Alexa voice assistant to recognize individual voices last month, and today it announced that it's going to let third-party developers get in on the fun sometime early next year.

The actual feature is known as "Your Voice by Amazon," reports TechCrunch, and it recognizes up to 10 different voices associated with a single Amazon account.