Google's new family plan for Play Music is probably the best deal you can get in streaming, but it actually extends way beyond just music. Once you set up a family payment method and invite everyone in, each individual family member will be able to purchase apps, games, movies, TV shows, ebooks, and magazine issues. Google outlines all that's possible with the new plan at this FAQ page.
"Members of your family group can make purchases on Google Play using the family payment method without your approval," Google warns. That payment method is separate from whatever payment method is linked to your individual account; the new family option just shows up as another payment method when buying digital media.
And though family members don't need permission to make purchases, you'll at least get an email each time one is made — and can require approval for every in-app purchase across the entire family. Also, the designated family manager can see a master list of all purchases. Notably, you can't use the family option to purchase hardware from the Google Store or increase your Google Play balance, the latter of which seems like an odd restriction. The family payment method can't be used for Android Pay purchases, which makes a bit more sense. But overall, it's a really useful thing that Google has just given Android users.