What to do when a principal died before interview date scheduled?

It would be courteous to inform the embassy of your mother’s death so that her case can be closed out. Insofar as your siblings are concerned, you can sponsor them under the F-4 category for siblings of U. S. citizens, and the time for final processing would be approximately 12 years. Otherwise if they have education and/or skills which are required in the U. S., they may be able to eventually obtain nonimmigrant or immigrant visas. Also if they form an attachment with a U. S. citizen or LPR, they may be able to immigrate faster under the family based case. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.