Do your classroom and pool skills sessions at home! There are several reasons for this, mainly not to waste your vacation time sitting in a classroom doing tests but also since your wife is not as enthusiastic it will give her more time to decide if she wants to do it or not, more time with an instructor in the pool learning how to clear her ears and masks skills, etc. That is VERY very very important.... if you want to get certified, you want to be comfortable with ALL your skills in the pool before you venture into the ocean.
Also, I am sure your 12 year old is excited, but not all kids are ready for the responsibility at that age. Kids usually do very well on all the written tests but when they get in the water they are sometimes unsafe as they get so excited and don't understand fully the risks involved (like zooming to surface, holding breath, etc.). I am not saying your child isn't ready, but I am saying that doing the classroom and pool sessions at home is a better place to evaluate that rather than on a vacation where you have already paid $$$$ and the instructor just wants to rush you along so he can get paid. Also, some kids just get exhausted very easily and diving is very stressful for them. (Our daughter got certified at 12 and although she was mentally in it and very safe, her body wasn't quite up to it and she spent much of our first vacation napping and eating! A year later she was much better, and by 14 she was fine with no exhaustion problems.) Another concern for your child is how physically developed they are - there are no definitive studies on how diving affects them. Some people feel it is no big deal, others say a kid should be close to their adult size regarding heart, lungs, air passages, etc. You and your instructor can make those assessments in the pool sessions. Remember, the Junior certification is the same certification as adults (but with restrictions on depth and need for DM with them to dive) - the kid still has to do all the same skills, carry gear, set up gear, everything for themselves to prove proficiency!
I am not trying to discourage you from getting you, your wife, and son certified - I am just trying to get you to do your classroom/pool sessions at home BEFORE your vacation. You will probably get much more out of your classroom sessions and the pool sessions won't be rushed so all 3 of you can learn the skills and be comfortable before you need to use them in the ocean.

Then when you get to Roatan or Utila, all the instructor has to do is take you in the water, have you perform each of the skills you already perfected back home, and check them off.
~~Just the 2 cents of an instructor's wife who spends alot of time with students, their families, and discussing ALL these issues with them often. ~~~
robin
