Correct wording: "I am officiating my sister's marriage ceremony today." Incorrect: "I am marrying my sister today." LFMfrind'sF

If you've taken to calling your best friend and brother's wife your sister, you might want to remember to add the "in-law" when talking to new people. Saying that your brother and sister have two beautiful kids will earn you some strange looks. #LFMF

Never get caught taking a picture of your sister's baby with a pack of birth control pills, no matter how hilarious it is. #LFMF

Calm down. the faint scream you heard was NOT the cat you saw run across the street. It was a game your sister is playing on her iPod. there's not need to pull over and look for the body. #LFMF

When trying to introduce your six-year-old little sister to My Little Pony, please remember that there's always the chance that she will call you a baby and tells your parents. Dinner will be awkward.

That pretty girl across the room that looks kinda like your sister? Yeah, you're drunk. That is your sister. Asking her out on a date will only make things extremely awkward. #LFMF

When calling your younger sister to your bedroom for help with a dress, make sure that you have put away the vibrator and the lube. #LFMF