Here is a beautiful poem on father by an unknown author:

What Makes a Dad

God took the strength of a mountain,
The majesty of a tree,
The warmth of a summer sun,
The calm of a quiet sea,
The generous soul of nature
The comforting arm of night,
The wisdom of the ages,
The power of the eagle's flight,
The joy of a morning in spring,
The faith of a mustard seed,
The patience of eternity,
The depth of a family need,
Then God combined these qualities,
When there was nothing more to add,
He knew His masterpiece was complete,
And so,

He called it ... Dad

from: http://www.indianchild.com/fathers_day_poems.htm

More such poems can be found at this link
http://www.funmunch.com/events/fathers_day/fathers_day_poems.shtml