Need help? Check out Spotify Answers for solutions to a wide range of topics.
Hey @daisyvn! Welcome to the Spotify Community. ^^
Premium for Family is for you and up to 5 additional members. That means you can have 6 people in total on the same plan - each enjoying their own Premium account under one bargain price!.
But you can only stream music on one device at a time with one account. If you begin playback on another device, the playback on your current device will be paused.
Be sure to check this Q&A about Spotify Family for more details. ^^
Let us know if that helps, thanks! ^^ Peace