This is a tab I found on UG, it's got not author so I can't say who transcribed 
all the chords, but I completely re-did the solo, I couldn't find a decent tab of 
it anywhere on the net. 
I also formatted so it's a bit easier to follow through with the song. The solo is 
going to be a bit off but it's pretty damn close. 
If your interested, I transcribed the solo off of a Youtube clip, only decent one 
I could find, here's the link to the clip, it may help :) ENJOY!!!

http://www.youtube.com/watch?v=wO84NFc-83k&feature=related

Mattech
mattattafe@hotmail.com

Cat Stevens - Father and Son

--------------------------------------------------------------------------
Chords:    G (320003@1)     C/G (3x555x@1)     Bm7 (x20202@1)       C (x32010@1)      Am7 (x02010@1)     Em (022000@1)     D (xx0232@1)       355433    335553    224232     332010    x02013   022000   x00232
--------------------------------------------------------------------------
-Brackets mean ghost note - don't strum but let the last strum ring through eg.(10)
-Dot means don't let the note ring out eg. 5.

Intro
                                          ***
E |-----3-----3------3---3--------3--------5----------|
B |-----3-----3------3---5----------------------------|
G |-----4-----4------4---5----5-------5---------5-----|
D |-----5-----5------5---5----------------------------|
A |-----5-----5------5---3----------------------------|
E |-----3-----3------3---3----------------------------|

***(Whilst holding down C chord, move little finger off
 2nd string, & use to play 'A' note * on 1st string)

Verse 1
          G (320003@1)             D (xx0232@1)            C (x32010@1)         Am7It's (x02010@1)not time to make a change, just re-lax, take it easy,
               G (320003@1)               Em (022000@1)              Am (x02210@1)              DYou're (xx0232@1)still young, that's your fault, there's so much you have to know,
        G (320003@1)           D (xx0232@1)         C (x32010@1)           Am7Find (x02010@1)a girl, settle down, if you want, you can marry,
        G (320003@1)       Em (022000@1)         Am7 (x02010@1)   C (x32010@1)  DLook (xx0232@1)at me, I am old, but I'm happy

Verse 2
        G (320003@1)             Bm7 (x20202@1)        C (x32010@1)               Am7 (x02010@1)       GI (320003@1)was once like you are now, and I know that it's not easy to be calm,
              Em (022000@1)                Am7 (x02010@1)D (xx0232@1)              G (320003@1)          Bm7When (x20202@1)you've found something going on,    but take your time, think a lot,
                  C (x32010@1)           Am7 (x02010@1)               G (320003@1)              EmWhy, (022000@1)think of everything you've got, for you will still be here to-morrow,
            D (xx0232@1)      G (320003@1)
But your dreams may not

Fill - (the last G of the verse is the start of the fill) 
        GE (320003@1)|-----3-----3------3---3--------3--------5----------|
B |-----3-----3------3---5----------------------------|play twice.
G |-----4-----4------4---5----5-------5---------------|2nd time round
D |-----5-----5------5---5----------------------------|only play 1st half.
A |-----5-----5------5---3----------------------------|       |
E |-----3-----3------3---3----------------------------|       | 
  \_______________________/