If you have a joint sponsor, they must also complete Form I-864. If you are using the income of other household members to qualify, then each household member who is accepting legal responsibility for supporting your relative must complete a separate Form I-864A, Contract Between Sponsor and Household Member.
In principle, there is no restriction on the number of people you can sponsor. However, the amount of minimum income required to sponsor a family member varies depending on the number of people you want to sponsor.
If you are using the income of people in your household or dependents to qualify, a separate Form I-864A for each person whose income you will use. However, an intending immigrant whose income is being used must complete Form I-864A only if their spouse and/or children are immigrating with them.
For SOME sponsors: If you are sponsoring more than one intending immigrant listed on the same affidavit of support, photocopies of the original affidavit of support may be submitted for any additional intending immigrants listed. Copies of supporting documentation are not required for these family members.
What do family members need if they have separate visa petitions? Each family member with a separate visa petition must submit a signed Form I-864 with supporting documents from the petitioner/sponsor and Form I-864As with supporting documents from the joint sponsor(s) if applicable.
Yes, you do have to file completely separate petitions for each one. They will not be related at all so you must send everything twice.
Each person should have their own online account even if they are minors.
If two joint sponsors are used, each joint sponsor is responsible only for the intending immigrant(s) listed on the joint sponsor's Form I-864. Every joint sponsor must meet the minimum income requirement, citizenship, residence and age requirements.
In theory, you can sponsor as many family-based immigrants as you want. However, each applicant must file a separate immigration application, and for each immigrant, the sponsor must file a separate I-864. This means that the sponsor must meet the financial requirement for each immigrant separately.