How to read tablature? 
Intro - strum or fingerpick, x2 -:

    Gb             Ebm            B               Db 
xA|-------3-----|-------0-----|-------0----0~-|-2-----|
xE|----0-----0--|----0-----0--|----1------1---|---3---|
xC|-0---------0-|-0---------0-|---------------|-----2-|
xG|-------------|-------------|-2-------------|-------|

Verse:
Gb               Ebm                 B 
I remember your bare feet down the hallway
  Db                    Gb 
I remember your little laugh
                 Ebm 
Race cars on the kitchen floor
        B            Db                         Gb   - Intro part - Ebm  B  Db 
Plastic dinosaurs, I love you to the moon and back

Verse
Gb               Ebm                B                 Db                  Gb 
I remember your blue eyes looking into mine like we had our own secret club
               Ebm             B             Db                       Gb 
I remember you dancing before bed time then jumping on me waking me up
                     Ebm 
I can still feel you hold my hand
B           Db                       Gb 
Little man, from even that moment I knew
                           Ebm 
You fought it hard like an army guy
  B                      Db 
Remember I leaned in and whispered to you

Chorus:
B                  Db 
Come on baby with me
                    Gb      B 
We're gonna fly away from here
    B       Db          Gb     Ebm  B  Db 
You were my best four years

Verse:
Gb              Ebm                  B 
I remember the drive home when the blind hope
          Db                      Gb 
Turned to crying and screaming, "Why?"
                        Ebm 
Flowers piled up in the worst way
             B                   Db 
No one knows what to say about a beautiful boy who died

Verse:
Gb                    Ebm 
And it's about to be Halloween
             B            Db                        Gb 
You could be anything you wanted if you were still here
               Ebm              B 
I remember the last day when I kissed your face
  Db 
I whispered in your ear

Chorus:
B                  Db 
Come on baby with me
                    Gb      B 
We're gonna fly away from here
B                      Db                          Gb 
 Out of this curtained room in this hospital grey
                 B 
We'll just disappear
                  Db 
Come on baby with me
                   Gb       B 
We're gonna fly away from here
    B       Db         Gb 
You were my best four years

- Intro part -

Bridge:
            B                Db                Gb 
What if I'm standing in your closet trying to talk to you?
          B                Db                    Gb 
What if I kept the hand me downs you won't grow into?
              B                   Db             Gb 
And what if I really thought some miracle would see us through?
                B           Db                B           Db - once -
But what if the miracle was even getting one moment with you

Chorus:
- B -               Db 
Come on baby with me
                   Gb       B 
We're gonna fly away from here
                  Db 
Come on baby with me
                   Gb       B 
We're gonna fly away from here
    B       Db         Gb 
You were my best four years

Outro:
Gb               Ebm                 B 
I remember your bare feet down the hallway
  Db                        Gb 
I love you to the moon and back