the parents may refuse consent for marriage on any ground

...the parents “may refuse consent on any ground and that they are responsible to God alone.” Baha’is who marry without providing verified parental consent are subject to deprivation of their Baha’i administrative rights and privileges.

-The Universal House of Justice

https://file.bahai.media/e/e7/The_American_Bahá’í_Vol5_No1.pdf