We believe, as Sodapop does, that Sandy is pregnant when she goes off to her grandmother's in Florida. It was commonplace at the time for young ladies who were pregnant to be shipped off to a distant relative to hide their condition. Soda is devastated at the separation from Sandy, something that his brothers only appreciate by the end of the text. He had offered to marry Sandy, and is distressed when his letters to her are returned unopened. A further blow to him is the revelation that he may not actually be the father of the child: a possiblity which shocks both him and the reader.