He views the entire household as members of her herd. She will test for her position in her herd. Unless your pig sees you and other humans as higher up the herd ladder, she will think twice about doing what you ask. He may even challenge other humans who enter his herd. You control his food, his environment and his exercise.
Nothing is free.
Make your pig earns what he wants. Teach him tricks and ask him to perform before he gets what he wants. Take control and dont spoil your pig. Remind yourself that eventually your pig will learn what is acceptable in your family and what is not. Try to be patient and consistent in your approach.