>>>Here's a fun one. http://www.boingboing.net/2005/08/24/puzzle_of_the_month_.html
>>
>>I figure the ages are 3, 3, 25.
>
>I would go with 15, 5 and 3.

Hilmar's answer is correct. It took me at least 10 minutes to do all the calculations. There are only two sets that gave the same sum:
15*15*1 and 3*3*25. The last question determines the answer.