Finally, at long last... our family obtained VIKI!! I can't believe this took longer than the Catherine and Clarie quest. :(
A blue rough stone also dropped from the Violent Gecho at least! That day seemed to be our lucky day with both the Mahmud and rough stone drop.
The Holiday patch has ended for a few weeks already and here's a picture of the last day of the event with our family celebrating with a snowman.