Answer: Marriage as happy event in a family
Step-by-step explanation:
When you are writing a letter, you have to write:
From
Name
Address
To
Dear, Brother!
How are you? How is life? I hope that everything is perfect. At home, we are great and very happy. I've got many good grades at school and I can't wait to see you again.
Also, I have exciting news for you. Our sister is getting married! We were shocked and happy at the same time when she told us. Another new thing is that we are planning a family trip and I wish that you will come soon because we miss you so much.
Take care! We love you!
Your lovely,
Brother