Contracts when selling my puppies?

I am expecting me ***** to have a litter of puppies on 14th of March, I have plenty of money saved away to take good care of the puppies and in case my ***** has problems giving birth. I have spoken to my family about selling the puppies and told them that I have written out contracts for the buyers to sign, basically stating that they will take proper care of the puppies and get veterinary treatment when necessary. It also states that if they can no longer take care of the puppies they must bring back to myself (the breeder) for me to sell, this will make sure the dogs do not get put in a shelter. My family seem to think this is a bad idea and will scare potential buyers off. I personally think this is very important when selling puppies and is responsible! what are your views?