No worries about the spelling. I believe the only way to reset the Family Settings passcode is either via answering the Family Settings security question, or by contacting Xbox Customer Support on the phone. Nothing on the website, as far as I know.
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Same answer as in the other thread you posted in, there is no way to do this on the computer, you will have to contact phone support, please use this link to arrange a call back from Support in your region: