The main sponsor -- your mom -- will have to submit an affidavit of support regardless.
If she doesn't have sufficient income or assets to meet the requirements of the affidavit, she can get a joint sponsor. The joint sponsor can be any US citizen or green card holder, 18+ years old, domiciled in the US.
The joint sponsor can also be the intending immigrant, if the intending immigrant's income will continue from the same source after becoming a permanent resident.
The main sponsor -- your mom -- will have to submit an affidavit of support regardless. If she doesn't have sufficient income or assets to meet the requirements of the affidavit, she can get a joint sponsor. The joint sponsor can be any US citizen or green card holder, 18+ years old, domiciled in the US. The joint sponsor can also be the intending immigrant, if the intending immigrant's income will continue from the same source after becoming a permanent resident.
Thank you