DNA of Saddam and Osama

You hear that they would attempt to identify Saddam’s or Osama’s bodies by use of DNA.

Where would they get the DNA to compare it to?

Relatives? When they flew Osama’s relatives out of the USA after 9/11, was the price a sample? Or have they politely asked Arabia to provide samples from his family, with documentation of chain-of-custody.

You don’t hear reports that they are snipping samples from any of Saddam’s relatives in Iraq, like (if alive) his elderly mother for instance. Or (if deceased) digging them up for samples.

So ???