If i have a family member using my card and want to remove it from there acc what to do in order to do that

You need to turn off purchase sharing. See Share purchases with others in your Family Sharing group on Mac - Apple Support for example:

Turn off purchase sharing

When you turn off purchase sharing for your Family Sharing group, your family members lose access to all shared iTunes Store, App Store and Apple Books purchases and can’t make new shared purchases.

Only the family organiser can turn off purchase sharing for the group.

1. On your Mac, choose Apple menu  > System Settings, then click Family in the sidebar.
2. If you don’t see Family, set up Family Sharing.
3. Click Purchase Sharing on the right, click Stop Purchase Sharing, then click Stop Purchase Sharing again.

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