rights of mentally disabled getting married

Depends on the nature and extent of the disability. If the person is found competent to make that decision for themselves, then they have the exact same rights as anyone else who decides to get married. If that competency is in question, and a court later finds that the person was NOT competent, the marriage could be annulled, or, dependent on circumstances, the other party could potentially face criminal charges for a form of abuse. We'd need to know more to give any credible information, and the impact of mental disability on the marriage contract is something that would have to be evaluated by a court, should anyone choose to challenge it.

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I agree. Have you browsed through the information in LawInfo's Free Legal Resource Center to learn more about your issue yet? See: http://www.lawinfo.com/consumer.html and http://resources.lawinfo.com/en/index.html. You can certainly try to speak to a lawyer to determine what legal options may be available. In the meantime, you may be able to learn more on your own. Search the "Free Legal Resources" tab, or browse the Consumer Resources. Good luck.