best prepaid for family

[inquisitor]

These are my spontaneous suggestions:

AldiTalk
SIM card price: € 14.99 including € 10 credit, effectively € 4.99

me:
-internet around 3GB/month: Internet-Flatrate L (5GB valid for 30 days) for € 14.99
-free or very cheap calls with my wife: € 0.03/min or for free with Community-Flatrate available for € 2.99/30 days
-cheap rate to Romania mobile: € 0.29/min or € 0.017/min through voipyo and VoIP app on your smartphone

wife:
-free or very cheap calls with me: € 0.03/min or for free with Community-Flatrate available for € 2.99/30 days
-cheap rate to Romania mobile: € 0.29/min or € 0.017/min through voipyo and VoIP app on her smartphone

Lycamobile
SIM card price: € 0 if ordered online

me:
-internet around 3GB/month: Data-Flat 3GB (3GB valid for 30 days) for € 14.90
-free or very cheap calls with my wife: free*
-cheap rate to Romania mobile: choose between:

• Global S: 100 minutes to 45 countries incl. Germany and Romania valid for 30 days for € 4.99
  or
• Global M: 300 minutes to 45 countries incl. Germany and Romania valid for 30 days for € 9.99
  or
• Global L: 500 minutes to 45 countries incl. Germany and Romania valid for 30 days for € 14.99
  or
• Global 1200: Global 1200: 1200 minutes to 12 countries incl. Romania (calls to Germany NOT included) valid for 30 days for € 19.90
  or
• Rumänien Paket: unlimited calls to Romania and unlimited calls and SMS to other Lycamobile subscribers valid for 30 days for € 39.99

wife:
-free or very cheap calls with me: free*
-cheap rate to Romania mobile: choose between:

• Global S: 100 minutes to 45 countries incl. Germany and Romania valid for 30 days for € 4.99
  or
• Global M: 300 minutes to 45 countries incl. Germany and Romania valid for 30 days for € 9.99
  or
• Global L: 500 minutes to 45 countries incl. Germany and Romania valid for 30 days for € 14.99
  or
• Global 1200: Global 1200: 1200 minutes to 12 countries incl. Romania (calls to Germany NOT included) valid for 30 days for € 19.90
  or
• Rumänien Paket: unlimited calls to Romania and unlimited calls and SMS to other Lycamobile subscribers valid for 30 days for € 39.99

There are a couple of other bundles for international calls: http://www.lycamobile.de/en/bundle?id=3
But be aware that you most likely cannot combine a data-only pack with a combined data/voice-pack. As the latter come with not more than 1GB of data allowance, you will probably prefer to subscribe to a combination of voice-only and a data-only pack.

* for each recharge you will receive free airtime for calls to other Lycamobile customers valid for 30 days if you send an SMS saying "SPAR AN" to 2525 :
€5 = 200min
€10 = 500min
€20 = 1200min