Hi jacbak1015,
In a Family Sharing group, billed transactions will bill back to the Organizer's payment card, but if the individual group members have credits available (for example, from an iTunes Gift Card), the purchase will apply against those credits first, as outlined in this article:
After you set up your family, any time a family member initiates a new purchase it will be billed directly to your account unless that family member has gift or store credit. First, their store credit will be used to pay the partial or total bill. The remainder will bill to the family organizer's card. As the family organizer, any receipts generated by the transaction will be sent to you. Learn more about how iTunes Store purchases are billed.
Family purchases and payments - Apple Support
Regards,
- Brenden