That way your dad also might not be your dad because there is no proof that DNA tests are 100% secure and reliable.
Good point! Here how things are done in reality. If paternity of my dad comes into question and it needs to be answered, then I can get DNA test done. If I doubt the test, I can get repeated test, or test which follows different principles to determine paternity. This way I can increase the confidence that biologically he is indeed my dad -- if such a situation arises. This is how most of the medical decisions work. You can re-do the test or order an alternative test.
To do an analogous thing in Balakot scenario, we will need to hit those targets again, may be with bombs with a different guidance mechanism and with warheads big enough that there is no such doubt left. Our government balked at that idea. And unlike my dad's biological paternity for me, Balakot was a matter of national importance.
So thats why they closed the place for 40 days?
To be honest, they claimed that place was not in active use. To maintain that front, I am not surprised they kept the place closed. Honestly, if they are operating a terrorist training camp, they will not exactly like to attract too much attention to place anyways, won't they? Even the visit after 40 days was too much orchestrated for that reason.