One of the nice features of the Southwest Companion Pass is that you are not locked in to maintaining the same companion for the entire time that you have the pass. Maybe you have a best friend who you normally travel with and have designated as your companion, but want to take your mom on a dream beach vacation to Hawaii. Southwest allows you to change your designated companion up to three times each calendar year that you maintain Companion Pass status.
So, you could change your companion from your best friend to your mom (1st change), go sit oceanside with a coconut cocktail, and then come back with a new suntan and change your designated companion back to your bestie (2nd change).