The Secretary may adjust the qualifying rent established for a project under subparagraph (A) of paragraph (1), only if the Secretary finds that such adjustment is necessary to support the continued financial viability of the project and only by such amount as the Secretary determines is necessary to maintain continued financial viability of the project.
Housing shall qualify as affordable housing despite a temporary noncompliance with subparagraph (B) or (C) of paragraph (1) if such noncompliance is caused by increases in the incomes of existing tenants and if actions satisfactory to the Secretary are being taken to ensure that all vacancies are filled in accordance with paragraph (1) until such noncompliance is corrected. Tenants who no longer qualify as low-income families shall pay as rent the lesser of the amount payable by the tenant under State or local law or 30 percent of the family’s adjusted monthly income, as recertified annually. The preceding sentence shall not apply with respect to funds made available under this Act for units that have been allocated a low-income housing tax credit by a housing credit agency pursuant to section 42 of title 26.
A family described in this subparagraph is a family that consists of at least one elderly person (who is the head of household) and one or more of such person’s grand  children, great grandchildren, great nieces, great nephews, or great great grandchildren (as defined by the Secretary), but does not include any parent of such grandchildren, great grandchildren, great nieces, great nephews, or great great grandchildren. Such term includes any such grandchildren, great grandchildren, great nieces, great nephews, or great great grandchildren who have been legally adopted by such elderly person.