Father is ill and can't emigrate.

I'm sorry to see this, but I still have to answer this question: if the main beneficiary dies, the immigration procedure will be terminated.

Your uncle is the main applicant, your father is the main beneficiary, and you and your mother are the secondary beneficiaries. If the main applicant dies, there is still the possibility of loosening. As long as other relatives in the United States are willing to help you apply for it instead of him, there is still a chance to continue after the immigration review.

However, once the main beneficiary dies, it means that the person who can apply legally no longer exists. Only when the main beneficiary is established, other affiliated beneficiaries are regarded as one of the legal applicants.

Suppose: If your father were alive, your family would pass the interview and get a visa. There is an important reminder on the visa package: everyone must enter the country with the main beneficiary, otherwise they are not allowed to enter the United States. Therefore, the death of the main beneficiary means that you lose the qualification to rely on him to come to the United States.

Now the United States is not easy to mix, the economy is not good, and life is depressed. Don't come if you can live at home. Good luck.