These chords are just about 100% accurate. I determined them by watching multiple videos 
of GBS performing this song live.


Capo 1st fret, Standard tuning


Intro:
D  A  G  x2

Verse 1:
D
Her brother can be difficult

  A
A blessing and a curse

    G
But a livin' life without one


Is somethin' far worse

D
Together in fraternity

  A
A sentence set for life

G
Laced with petty rivalries

       D            A
And ready for a fight

Verse 2:
Together in fraternity
A sentence set for life
Laced with petty rivalries
And ready for a fight

Verse 3:
When nothing's ever left unsaid
The battle lines are drawn
Promises are broken
Attack again at dawn

Verse 4:
Weapons drawn and ready
And who will fire first
Hands strong and steady
Hit exactly where it hurts


Chorus:
        G                    D
But you never lead a love so rare
    G                    D    A
You never lead a love so long
Em7/B             G/f#    G
Remember that the life we share
    A
Is nothin' but a song

Verse 5:
So you put on a happy face
For everybody new
But the closest to your heart
So rarely get the best of you

Verse 6:
A moment's contradiction
And the bickering's begun
Daughters after mothers
And fathers on their sons

(Chorus)

Bridge:
 Bm                   A                     G
Ahhhhhhhhhhhhhhhhhhhhhh, Ahhhhhhhhhhhhhhhh, Ahhhhhhhhhhhhh (x4)

(Chorus)

Outro:
D A G (x2)
Bm A G