My understanding is that the name on the FF account has to match the name on the Marriott account where the points are coming from. If my understanding is correct, then the answer is no. What you could do though is order the award, get the points yourself and then use the points from your account for an award with your son's name.

[Edited to add]
Found this post by Chris: http://www.flyertalk.com/forum/showp...9&postcount=24