The child's mother could be entitled to wife's or mother's benefits but does not file.
This may raise a question about her marital relationship to the NH (unless her entitlement
would affect the benefit rates of the children).
If her explanation for not filing is reasonable (e.g., she did not file due to work,
or because the minimum benefit is involved (RS
00208.105)) and no other information in file raises a question about the marital relationship,
proof of marriage is not necessary. Otherwise, if the child's entitlement depends
on State law status, documentary evidence of marriage is necessary. See GN 00306.090 through GN 00306.130 for possible entitlement of the child under Federal provisions.