Here is a fun family home evening idea on service. We've found that unless we make the lessons interactive, the kids lose interest in what we're trying to teach.
Sing "Love One Another"
Have the kids build a tent in the living room (this was their favorite part) and in your own words share verses 5-7 from the Book of Mosiah.
Explain that you're going to pretend they're the people from the Book of Mormon and have them build a tent so they can listen to the words of their King.
Have King Benjamin read verses 9-19 of this inspiring address to his people:
Give everyone a chance to pretend to be King Benjamin and share their testimony about the importance of serving one another.