I think that as much as DNA can prove paternity, it can’t absolutely disprove it for a female child. There’s always the rare case of the DNA of the blood being different. Less rare is if the father was a bone marrow recipient in which case if they took the DNA of his blood it will appear that none of his children are his.
To be fair, I was really more thinking about blood typing than DNA.
In any event, even for DNA, it’s really been well-proven. Yes, you may have the oddball case (identical twins, bone marrow recipients [will that overwrite the person’s natural DNA? I wouldn’t think so, but I don’t know for sure] and the like), but for 99.99999% of humanity, it’s proven and unlikely to be overturned in 50, 100 or 1000 years. It’s likely to be refined, but proven wrong? No.
The Wolf