... the validity of a Bahá'í marriage is conditioned upon
the consent of the two parties and their parents only. So that in case the
other members of your family show any dislike or opposition to your sister's
union with ....., their approval does under no circumstances invalidate it.
Your parents' approval would be sufficient, even through all the rest of your
family may violently oppose it.
(From a letter dated 31 March 1937 written on
behalf of Shoghi Effendi to an individual believer; compilation ‘Consent of
Parents to Marriage’, prepared by the Research Department of the Universal
House of Justice)