American brothers and sisters' immigration support ability

Your second sister, her own resources meet the standard, so she applies alone. If your income and taxes are not up to standard, you have to find a deputy guarantor, that is, financial guarantee.

To apply for you, you can only apply one by one. You can't apply for all three of you at the same time.

If you apply, it will be your family. For example, if you apply, it's your wife and your children.

It is best for your second sister to consult a lawyer.