A Careful Boy I want to Be

I recently heard a story about, "Please." In the story, one boy is extremely rude while his older brother is extremely polite. What ends up changing the younger brother's attitude is the example his older brother set. When the younger brother sees how polite his older brother is, he thinks "Hmm... I wonder what it would be like to be like that?" And then he changes.
The examples we set for our families are so important.
I love this poem:

A careful boy I want to be;

a little brother follows me.

I do not dare to go astray

for fear he'll go the self-same way

I cannot once escape his eyes;

what e'er he see me do, he tries.

Like me he says he's going to be-

that little brother following me.

He thinks that I am good and fine;

believes in every word of mine.

The bad in me he must not see-

that little brother following me.

I must remember as I go

through summer's sun and winter's snow

I'm building for the years to be

that little brother following me.

Finally, Elder Gene Cook from the Quorum of the Seventy shared the story of his brother's example:

When I was a boy, my family wasn’t very active in the Church. When my older brother, Ron, was turning 12, a man in the ward convinced him to become a deacon. ...When Ron was about 17 and I was about 12, his teacher told him that he needed to gain a testimony of his own. He said to me, “I intend to find out for myself if the Church is true. I’m going to pay any price to know for myself.”
Over the next few weeks, I watched him. I’d find him on his knees praying. I’d see him reading the Book of Mormon. I was amazed at how diligent he was.
... Later ..., Ron told me,  “...I now know for myself that the Church is true. ...Because of what has been happening to me in reading the Book of Mormon. I’ve got my testimony by reading and praying over every page. I know all that we’ve been taught in the Church is correct, and I am going on a mission.” I’d never heard Ron say that before. It was evident to me, even as a young boy, that he had really been impacted by something.
After Ron left me alone, I thought to myself, “If the Lord would tell my brother, then I’ll bet the Lord would tell me.” So I did what my brother did, reading and praying over every page of the Book of Mormon. Because I was still young, I didn’t understand a lot of the words, but it wasn’t long before I began to feel the Lord speak to me in my heart, telling me it was true. I read the whole book through and ended up with a strong testimony even at age 12. That really helped me through my youth and in preparation for a mission.
I have always been thankful for my good brother, who loved me enough to show me by example how to gain a testimony.

Heavenly Father has told us to "let your light so shine before men." I know that as we fearlessly and boldly testify of the truths we've learned to our family and friends they will be strengthened, and our example can lead them closer to Christ.