Google has announced at Google IO 2016 that they are bringing a new Family Library feature to the Google Play Store in July.
The Family Library feature on Google Play will allow you to share your purchases with members of your family, this will be default unless specific developers opt out of the program.
When the feature launched on the 2nd of July 2016, up to six people in the same family will be able to share their apps that they have purchased on Google Play.
It will be interesting to see how many developers decide to opt out of this feature, we will have more information closed to launch in July.
Source Android Police