Can I disable sharing my credit card form family members in AppStore?
I set up family access, and now all purchases of relatives in App Store using my card. Can I turn it off, without disabling family share of my purchased apps?
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You can disable the card, but that turns off purchases sharing. From the article below.
If you're the family organizer and you don't want to share a payment method with your family, turn off purchase sharing. When purchase sharing is turned off, you can continue to share subscriptions like Apple TV+ and Apple Arcade.
Family Sharing - purchases and payments.
You can try using Parental controls to limit purchases and for younger family members, you can turn on Ask to Buy.