Can your sister-in-law and her son immigrate to the US?
2 attorney answers
Your mother should consult with an attorney to determine if your sister-in-law and nephew qualify to continue their visa processing. If a principal derivative dies during the visa processing, there are limited exceptions for his derivatives to receive a visa. You should consult with an attorney to determine what options are available to your family.
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Yes, there's a chance the wife and son can still qualify. It's best to consult with an attorney to see what steps need to be taken.
Disclaimer: This answer is for informational purposes and does not take the place of a consultation with an experienced immigration attorney. This answer does not create an attorney-client relationship.