Here are the words to the song that begins at about 3:00:
Today, father, is father's day,
And we're giving you a tie.
It's not much we know,
It's just our way of showing you
We think you are a regular guy.
You say that it was nice of us to bother.
But it really was a pleasure to fuss,
For according to our mother,
You're our father,
And that's good enough for us.
Yes, that's good enough for us.