Same chord progression through the whole song: 
in this order G-C-G-C-Am-C-G-C-G 

The picking rhythm is very upbeat, it sounds way better tuned down a half step but  
standard is fine too.  


                        G 
When your dad left your mom 
                   C 
you moved into the condo 
                          G 
stayed there while he was gone 
                           C 
We stayed up late watching cable 
                 Am 
And we swam in the pool 
                C 
We ate all his food 
                 G 
Yeah we had so much fun 
           C            G 
When your dad left your mom 


                        G 
When your dad left your mom 
                     C 
She had to sell the house 
                        G 
We stayed up all night long 
                          C 
helping her move everything out 
                         Am 
In your empty bedroom upstairs 
                             C  
You kissed me like you didn't care 
                               G 
Hey what else could possibly go wrong? 
          C              G 
When your dad left your mom 


When your dad left your mom 
Your little brother stayed with us 
We helped him get his homework done 
We got him up and ready for the bus 
It was just for a few days 
While your mom moved into the new place 
And did what had to get done 
When your dad left your mom 

When your dad left your mom 
You'd get so quiet sometimes 
You'd say that nothing was wrong 
Like I couldn't see it in your eyes 
But every once in a while 
I could still get you to smile 
And I wrote you this stupid song 
When your dad left your mom