I need help with homework

For my grandparents 50th Wedding Anniversary, my parents aunts,and  uncles bought them tickets for a cruise. They said it was a small payback for all the things they did for them through the years and its something they would remember through out their lives. By the time they return they will have visited Barbados, St. Thomas, and other Islands. The trip is planned to be three weeks long. I hope they have a great time.

Explanation:

1. For my grandparents 50th wedding anniversary, my parents, aunts, and uncles bought them tickets for a cruise.

2. They said it was a small payback for all my grandparents are doing for them through the years.

3. and its something they (would) remember for the rest of their lives.

4. By the time my grandparents return they will have been gone almost three weeks.

5. In that time they visited Barbados, St. Thomas, and other Islands.

6. I hope they were enjoying their cruise now.

7. With luck, Have a great time.

I hope this makes sense and helps. I underlined the words I changed or added to help it make more sense.

she could put on music that makes her sleep