according to http://www.globalflight.eu/ you can credit CO miles to the following programs:

Aeroflot
AeroMexico
Air Europa
Air France KLM
Alaska Airlines
Alitalia
Continental Airlines
CSA
Delta Air Lines
Emirates
EVA Air
Korean Air
Northwest Airlines
Virgin Atlantic


What I would do if your family members earn at least 10000 miles each: You can credit those miles to Flying Blue and you'll get a AF/KL oneway flight within europe zone 1 for it (and this flight can be use by anyone including you, of course).