Object Lesson: Poor some salt on a colored plate, explain to your children that when we leave our Heavenly Father's presence we are pure and clean. Throughout our life sometimes we do things that are not right and can leave specks of dirt on our pure spirit. (start to sprinkle pepper on the salt)
If we say we are truly sorry and ask for forgiveness, those speckles can disappear. (as you are talking to your children about forgiveness, take a plastic spoon and rub it back and forth over the carpet, slowly put it on top of the salt and the pepper speckles will start to stick to the spoon from the static.)
What are some ways we can ask for forgiveness? Is it easy to ask for forgiveness we we know we have done something wrong?
What is the way that each of us can return to live with our Heavenly Father? By repentance.
Bear your testimony to your children, give them examples of how repentance has blessed your life.
Picture from The Friend, www.lds.org