You have probbly thaught about this already but, why not get him to record each of the "kids" a personal message that they can play back when needed. Don't forget yourself eather!
My Dad died of "the big C" and I found the help given by St Annes hospice (I think it is UK only, sorry) to be more help than I can say. Write a wish list and then do as many of them as you can!
All my best!