Avram – its stated openly in the HUD contract that the owner is not a family member of the renter. In the link below, see section 8c. I’d say it smells a bit crimey, not sure I understand the doubt expressed here.
http://portal.hud.gov/hudportal/documents/huddoc?id=DOC_11737.pdf
The owner (including a principal or other interested party) is not the parent, child, grandparent, grandchild, sister, or brother of any member of the family, unless the PHA has determined (and has notified the owner and the family of such determination) that approving rental of the unit, notwithstanding such relationship, would provide reasonable accommodation for a family member who is a person with disabilities