For this situation, you really will need a lawyer if you think that he is innocent, but I have a hard time believing someone would confess to a crime that got them 30 years and will force them to register as a child molester if they did not do the crime.
If it is suspected that he molested this child, and he has 2 children under 2 at home, this could actually HURT his case because the prosecutors will probably bring up the safety of those children.
If the young lady is 16, 17, 18, they may be able to charge her as an adult but that is also unlikely.
If you really intend on appealing this situation, you will have to get a lawyer. Many lawyers now have a free consultation to see if you have a case or not, so it may be in your best interest to call around and find one that can tell you if you have a case or not.

