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Consider having a Testimony Meeting where each family member gives their testimony, but they must say why they believe or why they feel the way they do about the Gospel - do this at your next Family Home Evening and it will help everyone to realize that it is not only about saying you believe, but also why you believe.
We have done this in our own family and it has proven to be faith promoting, not so much because of what is said as much as what is learnt, you see, because you are not in a formal setting you feel more relaxed to express yourself.