Cool_ant, can you please answer this for me - is this a quiz question or something? It has appeared on this site quite a few times in the past week or so.
No - it would be negative, but it would be close enough to tell that your brother is related to the father. By the way, potterfan is partly incorrect - identical twins do have the same DNA - but different fingerprints.
potterman3 is wrong. Identical (monozygotic) twins do, in fact, have identical genomes. So if you and your brother are identical twins then the DNA test would be positive.