In Act Three, the Stewart family and their friends get ready to eat their Thanksgiving dinner. And they give thanks.
Philip: Then in that spirit let's each of us give thanks. Each in his own way.
And Robbie gives thanks in his own way.
Robbie: I'd like to give thanks for Grandpa coming to live with us. And I'd also like to thank my math teacher for giving me a passing grade.
Later, after dinner ... 
Philip: Remember, the Michigan football game? And Michigan needs a touchdown.
Ellen: Did you forget something?
What did Philip forget?