Howard,

I'm late on this.... So you probably have an answer by now--it is Yes, provided 
you are in IOS 8 or above.

Procedure (from memory):

1.  One person needs to set up their phone under family-sharing as the 
Organizer.  App purchases will be handled by that account.

2.  Go to Settings, iCloud, Family-Sharing.

3.  Example: Enter your appleId as the organizer (primary member).  Then, go to 
add family members and add your wife.  Tell Apple that she is an adult (you can 
add children which would allow you to control apps they buy as well as in-app 
purchases and more).

4.  The phone will send invitations to the other family members to Join.

5.  Once they join, they will have access to any eligible apps that you 
purchased on your phone; it will be under a separate heading when they look in 
the app store.

Steve K8SP