When writer Lawn Griffiths and his twin brother, Lincoln, were born in a Des Moines, Iowa, hospital in 1946, his father was happy as a rooster, prancing in front of a flock of newly hatched chicks. To be a farmer learning that he had not only a boy to help him on the farm but now two gave him grand bragging rights. “Paul has twins!” his brother Don shouted to his wife Lillian as he ran acr . . .