Is this sentence a personification?

Buddy enters many contests but knows that his cousin's friendship is his real fortune.

Who/What is "Buddy"?

No. Personification is the attribution of human traits to an inanimate object.

http://library.thinkquest.org/J0112392/personification.html

Yes, this sentence contains the literary device of personification. Personification is when non-human objects or ideas are given human characteristics or qualities. In this sentence, the concept of "fortune" is being personified by stating that it is something that Buddy's cousin possesses.