Who is the father of philosophy?

This is an awesome question. As you can see there will be quite a bit of disagreement. 

Socrates is a pretty good answer, since Plato preserved much of his insights. Moreover, we are still taking about Socrates. Finally, he has shaped much of the Western world. 

Thales and others pre-Socratics such as Anaximander, Heraclitus, and Pythagoras are good answers as well. They clearly influenced Socrates. Moreover, Socrates would readily admit this. 

If we look at Herodotus, he also points in another direction. He states that the Greeks learned a lot from the Egyptians. So, much of Greek thought was taken from Egyptian priests. 

In my opinion, I would have to pick Moses from the Old Testament or the Hebrew bible. I choose him, because of his antiquity. He outdates all of these figures. He also gives a philosophy, even if it is very theistic. Finally, it can be argued that the Jewish tradition is even more influential than the Greek tradition in the Western tradition.