Criminal Law Questions? Ask a Criminal Lawyer.
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If the sibling thinks something is amiss and family members are suspicious of the new spouse, then the family members should convince the sibling to cut her losses now and get out of the relationship and disentangle herself from her new spouse. You would need to speak with a local divorce Attorney to build a case against the new spouse for marriage fraud and to get all assets of the sibling from the new spouse.
The sibling should help the family members to get her assets back by giving full inventory of her assets and the assets that are now either in the control of the new spouse or have been commingled with the new spouse's assets.
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