gene family and gene copy number

[xujie]

Hello everyone,
I am puzzled by the defination of gene family and gene with more copies.
Genes with the same sequences but reside in different locations of the chromosome. These genes should be classified as the same gene of different copies or genes of the same family?
what is the measurements for classifying these genes?
By the way, anyone knows a good way to find out the copy number of the same gene in genome?

Great appreciation in advance.

[xujie]

？？waiting for the answers

[arcolombo698]

I am also working on finding the copy number of a gene in a genome... there is a post here that suggests using cufflinks to extract the FPKM scores, and aligning to the ORFs ... did you find a solution to this problem?