Burden of proof
(f) Burden of proof. To establish the claimed relationship of spouse or child as defined in sections 101(a)(35) and 101(b)(1) of the Act, evidence must be submitted with the request as set forth in part 204 of this chapter. Where possible this will consist of the documents specified in 204.2 (a)(1)(i)(B), (a)(1)(iii)(B), (a)(2), (d)(2), and (d)(5) of 8 CFR chapter I. The burden of proof is on the principal alien to establish by a preponderance of the evidence that any person on whose behalf he or she is making a request under this section is an eligible spouse or child.