Genie linked to the previous thread, which gives the original (copyright 1948) lyrics by Swiss conductor/composer Paul Burkhard. That thread indicates that the song may have appeared in a musical that came out in 1939. The English lyrics, "Oh! My Pa-Pa," were written by John Turner and Geoffrey Parsons, published in 1953.
...or so says The Book of World-Famous Music.
-Joe Offer-

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In the interest of consolidation, here are the chords, as posted in another thread.

  C       Am*      C             G
  Oh my pa-pa, to me he was so wonderful
                                 C
  Oh my pa-pa, to me he was so good
   C            Am       C             G
  No one could be, so gentle and so lovable,
                                C
  Oh my pa-pa, he always understood
    C   E       Am        C         F      G
  Gone are the days when he could take me on his knee
   C    E      Am         B                 E    G
  And with a smile he'd change my tears to laughter
  
  Oh, my pa-pa, so funny, so adorable
  Always the clown, so funny in his way
  Oh, my pa-pa to me he was so wonderful
  Deep in my heart, I miss him so today