How do you edit how you're related to someone on Facebook? I feel RETARDED that I can't figure it out!

Of course now that my dad's on Facebook, my mom joined as well. I figured out how to change how you're related to someone if you've just added them as a friend. But, how do you go back and state how you're related to someone? I know it can be done because my cousin just edited to add that I'm her cousin.

HELP ME. I'm feeling horrible about a ton of other things right now, and this really doesn't need to be the straw that breaks the camel's back.

Ok, go to your friends section. Then toggle the friend over on the right. it lets you change the relationship there.

I don't get it :(

I see how to make a list of how friends are what friends, but I don't see how to say like "This person is my cousin" the way that my cousin did!

I held off joining Facebook until like May, and it doesn't make a whole lot of sense to me. BLEH.