It is possible for the child to be technically normal. However, if the family carries any recessive genes, and most do, there is a much higher than normal chance for these genes to be expressed in this situation. One example is albinism. Another would be hemophilia. Cystic fibrosis, sickle cell anemia, and Tay Sachs are other types of recessive characteristics. A talk with a genetic counselor could shed some light on the more likely possibilites. Many problems can be tested for prenatally with amniocentesis and genetic testing. Many others can't.
Hope this information is useful!
Thank you so much for your answer. It was very helpful. This is re. a 14 yr. old girl in the mountains of Mexico, who is now at the orphanage where my daughter is the director. So sad,