Probably Andy found some "old" cards with 25.82 euros of credit included, sold slightly discounted for 25 euros, during some promotional time.
If you and your family are going to talk much between yourselves, I suggest you to try out Wind with one of the "NOI" offers too.
With 15 euros you get 3 SIM cards with "noiwind" already activated (but you will need to top-up them, since the option will cost you the 5 euros included) so you can talk for 200 minutes to other wind phones
AndreA, you are slightly wrong in your message: All the options have free activation since today and until April