When cooking, make sure the snipping sounds coming from the living room are just you 4 year-old sister cutting up paper and not your best dress you were wearing to a date that night. #LFMF

When in the car while telling your fiancé how ginger kids are creepy, always, always always remember that you just picked up her ginger sister from work and is in the back seat. #LFMF

If your boss ever asks if your little sister likes the Jonas Brothers, before replying "No, thank god, because if she did I'd have to disown her", it pays to consider that she might be asking because her own daughter LOVES them. #LFMF

If your little sister wants curly hair, do not show her how to curl ribbons with scissors. #LFMF

When your girlfriend tells you her sister is a downtown hotdog vendor, spontaneously asking her sister "what corner do you work" could be taken the wrong way. #LFMF

When trying to complement your girlfriend tell her that she is prettier than her sister not her sister is uglier than she is. #LFMF