…wherever the law of the land or the Agreement of Adoption
prohibits future contact between an adopted child and its natural parents, the
Bahá'í Law does not require the child to seek the consent of those parents to
its marriage. However, children may very well wish to obtain the consent of
their foster parents although not obliged to do so.
- The Universal House of Justice (From a letter to an individual believer, December 11, 1973; compilation: ‘Lights of Guidance’)