Ashley Williams: The concept that Kimberly and I have that one individual can make a difference came from our mom, who is a fund-raiser for the Michael J. Fox Foundation. When I was 6 years old, I saw a story about children and mud slides in Central America, and I burst into tears of despair. I felt there was nothing that I, a little girl in Rye, N.Y., could do to help, but she said, 'Oh, yes there is.' We marched down to our church together, talked to the rector, and two days later we had organized this huge benefit. My mom taught me to be direct, jump in and take action.