Encourage your children to be more other-centered by having a special piggy bank to collect money for an altruistic cause. Together you and your child can decide how you want to support or sponsor another person in need.
Self-denial box: “Children are to be educated to deny themselves. …In every home there should be a self-denial box, and that into this box the children should be taught to put their pennies they would otherwise spend for candy and other unnecessary things… You will find that as the children place their pennies in these boxes, they will gain a great blessing… Every member of the family, from the oldest to the youngest, should practice self-denial.” Child Guidance p. 132