Subject: Thank you so much for being so kind.
I made it back home safely. I won't forget the happy days I spent with you and your family. Your parents took really good care of me. You, your brothers, and sisters always made sure I was comfortable. Your kindness and hospitality amazed me. The memories of my time with you will always stay fresh in my mind.
That's all for today. Sending my best wishes to your parents and love to your younger brother and sister.