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

    Bb             Gm            Eb               F 
xA|-------3-----|-------0-----|-------0----0~-|-2-----|
xE|----0-----0--|----0-----0--|----1------1---|---3---|
xC|-0---------0-|-0---------0-|---------------|-----2-|
xG|-------------|-------------|-2-------------|-------|

Verse:
Bb               Gm                 Eb 
I remember your bare feet down the hallway
  F                    Bb 
I remember your little laugh
                 Gm 
Race cars on the kitchen floor
        Eb            F                         Bb   - Intro part - Gm  Eb  F 
Plastic dinosaurs, I love you to the moon and back

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

Chorus:
Eb                  F 
Come on baby with me
                    Bb      Eb 
We're gonna fly away from here
    Eb       F          Bb     Gm  Eb  F 
You were my best four years

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

Verse:
Bb                    Gm 
And it's about to be Halloween
             Eb            F                        Bb 
You could be anything you wanted if you were still here
               Gm              Eb 
I remember the last day when I kissed your face
  F 
I whispered in your ear

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

- Intro part -

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

Chorus:
- Eb -               F 
Come on baby with me
                   Bb       Eb 
We're gonna fly away from here
                  F 
Come on baby with me
                   Bb       Eb 
We're gonna fly away from here
    Eb       F         Bb 
You were my best four years

Outro:
Bb               Gm                 Eb 
I remember your bare feet down the hallway
  F                        Bb 
I love you to the moon and back