Google Play Music started to offer a new family plan: $14.99/month for up to 6 family members, just like Apple Music. You and 5 other family members can subscribe to Google Play Music All Access and keep your own playlists, radio stations, ratings and recommendations. The new family plans are available in the US, Canada, the UK, Australia, France and Germany, while also requiring regular Google accounts (no Google Apps, for now). You can only sign up from the Google Play Music app for Android, but everything else works for all the platforms supported by Google Play Music.
Google says you can "share a payment method on Google Play so your family can purchase apps, movies, books and music." It looks like Google will add a family sharing feature for Google Play, so that purchases are shared between family members, just like in iOS.