Dear Kate(имя друга),
Thank you for your letter. It was great to hear from you!
In your letter you asked me about what my family and I doing at home today. Well, my mother cleans the rooms, cooks and watches TV. My father sits in the garage and repaires things. I helps my mother and plays a computer games.
By the way, what does your family today?
Write back soon!
Lots of love,
...(свое имя)