mdunker,
I have talked to Jack.
He researched several Social Security publications and found that they indicate such income can be used to help a guardian provide housing for the beneficiary. It is even suggested that the tax-free income be grossed up for underwriting purposes. It also suggested that if the beneficiary is within three months of his/her eighteenth birthday the income may not be acceptable for underwriting.
Again, this information is based on our interpretation of the information we read in various SS publications. We suggest you verify how guardianship benefits may be used with a specialist from the Social Security Administration or an attorney that specializes in SSI.