2 CFR § 180.905 - Affiliate.
Persons are affiliates of each other if, directly or indirectly, either one controls or has the power to control the other or a third person controls or has the power to control both. The ways a Federal agency may determine control include, but are not limited to -
(a) Interlocking management or ownership;
(b) Identity of interests among family members;
(c) Shared facilities and equipment;
(d) Common use of employees; or