Caractacus: 
Do you think I'm a lunatic? Wasting my time on a lot of silly inventions?

Jemima: 
But they aren't silly--they're wonderful!

Jeremy: 
Nobody else could think of them!

Caractacus: 
That's right! That is right--nobody else could think of 
them!--yeah--after all...
What makes the battle worth the fighting?
What makes the mountain worth the climb?
What makes the questions worth the asking?
The reason worth the rhyme?

Caractacus: 
To me the answer's clear;
it's having someone near; someone dear
Someone to care for; to be there for.
I have You Two!
Someone to do for; muddle through for.
I have You Two!
Someone to share joy or despair with;
whichever betides you.
Life becomes a chore, unless you're living for
someone to tend to be a friend to.
I have You Two!
Someone to strive for, do or die for
I have You Two!
Could be, we three get along so famously,
'cause you two have me, and I have You Two too.

(Breakfast is behind made, then Caractacus sneezes)

Kids: 
Someone to care for; to be there for.

Caractacus: 
I have You Two!

Kids: 
Someone to do for; muddle through for

Caractacus: 
I have You Two!
Someone to smile once in awhile with;
whenever you're lonesome
I've a happy lot,
considering what I've got.
But, I couldn't do more
Than you do for your poor Father.

(Kids: Daddy!)

Things go asunder
and I wonder why you bother.
All: 
Could be, we three get along so famously
'cause

Kids: 
we two have you, 

Caractacus: 
and I have You Two

All: 
too

[Thanks to selina_moses@hotmail.com for lyrics]