An applicant must, as soon as reasonably practicable, notify the Secretary or the principal officer to whom the application was submitted--
(a) if any person (other than the applicant or a person who submitted an application to adopt jointly with the applicant) resides on the same property as the applicant for 3 weeks or more, or
(b) if a person residing on the same property as the applicant attains the age of 18 years.