Dear Mom and Dad,
I just wanted to let you know how grateful I am for our sitter, Ms. Wang. She has been taking care of me while you two were away on business trip, and she has been absolutely wonderful．
Ms．Wang is more than just a sitter, she's like a second mother to me．She makes sure that I finish my homework, eats healthy food, and gets enough exercise．She also teaches me new things every day, such as how to make a origami crane and play chess．
I feel very lucky to have such a caring and knowledgeable sitter．She has made my stay at home enjoyable and productive．Thank you for hiring her, and I hope you two have a great trip．
Love，
[Your Name]