Big Macintosh would address his sister's friends? As of currently Big Mac has never actually referred to Applejack's friends by name, and to my memory, has only ever referred to Applejack by name once, in which he referred to her by the nickname her friends call her by, AJ. I've seen in fanfiction, that Big Mac is quite formal and polite, and puts Miss in front of the names when talking to the other Mane 6 members. so how do you think he would refer to them in-show?