20 C.F.R. § 684.630
(c) Officers or agents of the INA program grantee must not solicit or personally accept gratuities, favors, or anything of monetary value from any actual or potential contractor, subgrantee, vendor, or participant. This rule also must apply to officers or agents of the grantee's contractors and/or subgrantees. This prohibition does not apply to:
(d) No person who selects program participants or authorizes the services provided to them may select or authorize services to any participant who is such a person's spouse, parent, sibling, or child unless:
(1)