Woman giving up her right

Q: My wife gave birth to twelve sons and daughters. She has been rejecting to have sexual intercourse with me for a year saying that she does not need it any longer. Furthermore, she took Allah and her children, especially the elder son and daughter, as witnesses that she gave up her right in sexual relationship. My question is: Can her giving up this right free me from the liability? I sent this letter to you for fear of being sinful. I hope you will answer me soon.

A: If the reality is as the questioner has mentioned, her giving up this right is valid and the husband is not sinful. She is entitled to give up any of her rights. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions.