Do you do anything to show your kids about helping others and the real "reason for the season?" (whatever that might be to you.) I think LO1 is still a little young to grasp the concept if we were to help out at the homeless shelter, but we always give money to the Red Buckets and I explain that by giving our money it helps those who don't have any.
I think a little at a time, but eventually i want to take them to the local center to help and play with the kids there. I used to do it pre-kids and it really helps you be grateful for what you have.