There are some tools you can buy to remove data from interne

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The key thing is communication. Set up family check post. Whenever there are something related to money. Post it in the group so the family members can acknowledge together. 

Train your spouse and kids. Continue to learn fraud cases.

任何人都会被骗。无论多聪明的人。只要被人找到痛点，不被骗都很难。