Ask lots of questions. Remember that there are no stupid questions. Conscientious breeders will eagerly answer your questions and share their experience and knowledge with you. Only buy a piglet from a responsible and well-respected breeder. The risk is too great to your family to deal with breeders who are in question.
Responsible breeders are concerned with the betterment of the breed.
They work hard to breed only healthy, happy piglets, both mentally and physically. After you have chosen a breeder, screen her carefully. If possible visit the breeder's home so that you can see the parents of her piglets. Notice how the pigs and breeder interact. Realize the responsible breeder will be screening you also, as she looks for the best possible home for her piglets.