Do you need a speical type of DNA test to define the paternity between 2 brothers...?

Question

I know someone who has had a child and is unsure of her paternity, it is between 2 men, which are brothers... We are wondering if she would need a certain type of DNA test to define which is the father...? These brothers have the same mother and father also...

Answer 1

No, they can use the same DNA test as with anyone.  The two brothers only share about 50% of their DNA, so the test will be able to distinguish between them.  This is, of course, unless the brothers are identical twins, then a DNA test won't work at all!