I filed COS H1-F1 for my wife and we received RFE for to show the financial pay for the course and living expenses for the first year.

I submitted affidavit for her i-134 along with my pay stubs my annual salary is 83k. my lawyer says this RFE is normal we already submitted the affidavit for her me as a sponsor and we will respond RFE the same.

my question is my brother in law also ready to give additivity for my wife as sponsor so
can we submit two affidavits for her and are there any issues tow submit two affidavits ?

Is this complicated RFE ?

Could you please advise me how to respond this RFE.