$16k in student loans is nothing... and $8k is even better. IMO modest amounts of student loan debt are good debt... investing with a good likelihood of a postitive return.
What is he earning on those savings bonds? I'm guessing close to what he is paying in student loan interest. If so, I think keeping the savings bonds was smart.... you can't get that interest rate of return today and the student loan interest is only for a couple years.
What you might to is to offer to match whatever he saves in a Roth.... perhaps 2:1 for the first 2-3 years and 1:1 after that.
If something cannot endure laughter.... it cannot endure.
Patience is the art of concealing your impatience.
Slow and steady wins the race.
Retired Jan 2012 at age 56...target
65/35/0 AA TBD