38 CFR § 3.210 - Child's relationship.
(a) Legitimate child. Where it is necessary to determine the legitimacy of a child, evidence will be required to establish the legality of the marriage of the mother of the child to the veteran or to show that the child is otherwise legitimate by State laws together with evidence of birth as outlined in § 3.209. Where the legitimacy of a child is not a factor, evidence to establish legitimacy will not be required: Provided, That, evidence is on file which meets the requirements of paragraph (b) of this section sufficient to warrant recognition of the relationship of the child without regard to legitimacy.
(b) Illegitimate child. As to the mother of an illegitimate child, proof of birth is all that is required. As to the father, the sufficiency of evidence will be determined in accordance with the facts in the individual case. Proof of such relationship will consist of:
(1) An acknowledgment in writing signed by him; or
(3) Any other secondary evidence which reasonably supports a finding of relationship, as determined by an official authorized to approve such findings, such as:
(c) Adopted child. Except as provided in paragraph (c)(1) of this section evidence of relationship will include a copy of the decree of adoption or a copy of the adoptive placement agreement and such other evidence as may be necessary.
(1) In jurisdictions where petition must be made to the court for release of adoption documents or information, or where release of such documents or information is prohibited, the following may be accepted to establish the fact of adoption:
(ii) As to a child adopted out of the veteran's family, a statement over the signature of the judge or the clerk of the court setting forth the child's former name and the date of adoption, or a certified statement by the veteran, the veteran's surviving spouse, apportionee, or their fiduciaries setting forth the child's former name, date of birth, and the date and fact of adoption together with evidence indicating that the child's original public record of birth has been removed from such records. Where application is made for an apportionment under § 3.458(d) on behalf of a child adopted out of the veteran's family, the evidence must be sufficient to establish the veteran as the natural parent of the child.
(2) As to a child adopted by the veteran's surviving spouse after the veteran's death, the statement of the adoptive parent or custodian of the child will be accepted in absence of information to the contrary, to show that the child was a member of the veteran's household at the date of the veteran's death and that recurring contributions were not being received for the child's maintenance sufficient to provide for the major portion of the child's support, from any person other than the veteran or surviving spouse or from any public or private welfare organization which furnished services or assistance to children. (Pub. L. 86–195)
(d) Stepchild. Evidence of relationship of a stepchild will consist of proof of birth as outlined in § 3.209, evidence of the marriage of the veteran to the natural parent of the child, and evidence that the child is a member of the veteran's household or was a member of the veteran's household at the date of the veteran's death.
Evidence of dependents and age. See § 3.204.