Assuming there's no question the babies are identical twins then, no. A paternity test on one will answer the question. However if they are fraternal twins (not identical) then, yes, each must be tested.
There is no such thing as "semi-identical" twins. If fraternal twins each take a paternity test, only the real father would show up as the father.
Identical twins will have the same father, so a paternity test is done just like for any kid. With fraternal twins, it is possible, but very, very rare, to have different fathers for the babies.
Paternity test can be performed with newborn baby and even it can be done on unborn babies through mother's amniotic fluid but its risky process.
Nope...not unless the uncle and father are identical twins.
my qustion is can paternity test be wrong
Yes, a paternity test can be conducted both before and after pregnancy and will involve one of several different procedural options for each.
A paternity test can determine if there is a parent-child relationship between two people. A paternity test would give genetic proof of that relationship.
see link below "Can you have a paternity test while you are pregnant?"
There are several options for a paternity test. You can try www.gtldna.net for a home test.
Test can do online
There is no 'score' on a paternity test. the man is either NOT the father or he could be.
see link below "Can you have a paternity test while you are pregnant?"