thank for your replies.
Spouse has two minor children, so, i completed i-864A as in the Instructions for I-864 is states the following:
Item Numbers 8. - 22. Current Annual Household Income. This section is used to determine the sponsor’s household income. If your individual annual income listed in Item Number 7. is greater than 125 percent (or 100 percent if you are on active duty in the U.S. Armed Forces or U.S. Coast Guard and sponsoring your spouse or child) of the Federal Poverty Guidelines for your household size from Part 5., Item Number 8., you do not need to include any other household member’s income. See Form I-864P for information on the Federal Poverty Guidelines.
To determine the filing requirements for your relatives included in Part 6., Item Numbers 8. - 19., follow the instructions below.
1. If you included the income of your spouse listed in Part 5., Item Number 3., any child listed in Part 5., Item Number 4., any dependent listed in Part 5., Item Number 5., or any siblings, parents, or adult children listed in Part 5., Item Number 7., each one of these individuals must be over 18 years of age and must complete Form I-864A.
2. If you included the income of the intending immigrant who is your spouse (he or she would be counted in Part 5., Item Number 1.), you must provide evidence that his/her income will continue from the current source after obtaining lawful permanent resident status. He or she does not need to complete Form I-864A unless he or she has accompanying children.
3. If you included the income of the intending immigrant who is not your spouse, (he or she would be counted on Part 5., Item Number 1.), evidence that his or her income will continue from a lawful source after obtaining lawful permanent resident status must be provided and the intending immigrant must provide evidence that he or she is living in your residence. He or she does not need to complete Form I-864A, unless he or she has an accompanying spouse or children.