wow! what a wonderful way to express your appriciation for your friend, both through the letter and your willingness to watch their children. I have worked in daycares becofe and it can be a very tiring experience, but for a weekend...you are amaizing. I'm sure that your friend must feel as greatful to have you in his life as you are to have him. You should feel proud for making it through the weekend, I enjoy taking on challenges like that, you feel so much better about yourself when it is all over.