Wake kids up by singing the song This is the Day That the Lord Has Made or another song of praise. Modify the words to list things you are thankful for.
Sing the song This Is the Day That the Lord Has Made (or another suitable song) as a wakeup call or at breakfast each day. The lyrics to This Is the Day are widely available on the Internet.
You can also sing this song together at any time of day; it’s a great reminder when children are tempted to be ungrateful. As you sing the song, modify the verse by adding things or people you are thankful for. For example:
This is our family (2x)
Whom the Lord has given (2x)
Let us rejoice (2x)
And be glad with them. (2x)