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I am sorry to hear about your sister. I am afraid that anything that would be hers may be attached towards restitution, either by action of the US Attorney's Office or by private civil action of the victim. Because of this, purchasing any of her assets from her after she has been convicted is "risky," because it can easily be argued that the assets was being "hidden" to avoid being attached.
As such, while this is possible, it is not recommended.
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