I think drmatt's answer is a little misleading. The thing about comic books, especially Marvel comics, is that there are multiple universes, and in each universe characters can be drastically different, including how they relate to one another.

For starters, Sabretooth and John Howlett (James Howlett's father) are two different people. I feel that the answer from drmatt indicates they are the same person. John Howlett is Wolverine's father in the 'Origin' series, which came out after Wolverine had become a popular figure in the comic book world. But even then, in this origin story, there is a portion that seems to indicate that Wolverine's biological father may actually be Thomas Logan, who is Howlett's groundskeeper that ultimately kills John Howlett. In response to this, young Wolverine kills Thomas Logan (this is the scene you may have seen in the movie previews where the young Wolverine stabs a man with his claws).

There WAS a period of time in the comic universe where Sabretooth believed himself to be Wolverine's father, but this was later disproven. The identity of Sabretooth in relation to Wolverine is also still a mystery; some contend they are brothers (which is the route the movie seems to be taking), others say they were childhood friends (Sabretooth may have been known as 'Dog' in his youth).

So to answer your question: there is no concrete answer as to who his father is. It could be John Howlett or Thomas Logan. Or someone completely different. I think the writer's enjoy the ambiguity of the situation.

Here is a proper rundown of the Origin series:

http://www.typingmonkeys.com/wolverine/wolverine-the-origin/

And here is a collection of quotes and pieces of information regarding Wolverine's childhood and past:

http://www.typingmonkeys.com/wolverine/wolverine-wild-childhood/

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