The Chipmunks:
Someone to care for, to be there for

Alvin:
I have, you two

The Chipmunks:
Someone to do for, model through for

Simon:
I have, you two

The Chipmunks:
Someone to share joy or despair with
Whichever betides you
Life becomes a chore
Unless you're living for

Alvin:
Someone to tend to

Simon:
Be a friend to

Theodore:
Hehheh
I have, you two
The Chipmunks:
Someone to strive for, do or die for

Alvin:
I have, you two

The Chipmunks:
Could be, we three, get along so famously 'cause

Simon:
You two, have me, and I have you two, too

Dave:
That's very nice fellas, but, aren't you forgetting somebody?

Alvin:
I don't think so, Dave. Who?

Dave:
Well, I thought there were four of us

Alvin:
What, um, did you have in mind, Dave?

Dave:
Well, someone to care for, to be there for
I have, you two
The Chipmunks:
Someone to do for, model through for
We have, you two

Dave:
Someone to smile once in awhile with
Whenever you're lonesome
I've a happy lot
Considering what I've got, hahaha

The Chipmunks:
Your shoulder to cry on, we rely on
Like a father

Dave:
Things go asunder
And I wonder, why you bother

The Chipmunks:
Could be, we three, get along so famously 'cause
We two, have you

Dave:
And I have you two

The Chipmunks:
And we have you two
The Chipmunks & Dave:
And I have you two, too!