We have a good side and a bad side. Each person has both the good and bad side to everyone, depending on which side is more than that. Which side would demonstrate the personal habits of the individual.
We have both the good and the bad. Each person has both good and bad, all depending on which side it is over. This will demonstrate the various personalities of different individuals.
We have both good and bad side. Each person is both good and bad people depends on whether it has the more. Which aspects will demonstrate the personality of the individual services.