Just want to make sure I understand what you are saying

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You are saying to go into the admin control panel and set the cookie domain to familycorner.com, then to have the registered users only use that domain when they enter the boards, is that right?
Problem with this is that I get visitors for both thefamilycorner.com and familycorner.com. Therefore, when someone clicks the link for the boards, they are taken to the /forums directory for whatever domain they entered on. For example, if they arrived through
www.thefamilycorner.com then they will be taken to
www.thefamilycorner.com/forums, but NOT to
www.familycorner.com/forums
Did that mak sense? Sorry for the trouble, and thank you for your help