I think that song has been tabbed before, but everything I read was wrong somehow. 

I think this is the way it's played. 


Intro/Verse
e----2---0----2---0-----------------------------------------
B------3---3----3---3----3---3/5-2---2/3--------------------
G--------------------------0-------2------------------------
D----0---0----0---0-----------------------------------------
A--------------------------------0---0----------------------
E------------------------3---3------------------------------

Chorus
e-----------------------------------------------------------
B----3---3---3---3-------2---2---2---2----------------------
G------0---0---0---0-------2---2---2---2--------------------
D-----------------------------------------------------------
A------------------------0---0---0---0----------------------
E----3---3---3---3------------------------------------------

• grandpa