With respect to section .42(a)(4)"Indicator of Gross Income", the 2001 Q&A states that "if an institution considered or relied on gross revenues of a cosignor or guarantor that is not an affiliate of the borrower, such as a sole proprietor, the institution should not adjust the borrower's revenues for reporting purposes." The Q & A goes on to explain that the "purpose" of the revenue data collection is to determine if banks are making loans to small businesses or "merely making small loans to larger farms and businesses". In that sense I would say that you should not include the revenue of the individual guarantor.
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