"Common descent is supported by numerous independent lines of evidence, the most convincing of which is the same kind of DNA evidence that establishes parenthood in the courts."
The evidence that I've seen that establishes that sort of lineage has wholly been on species that Creationists agree had a common ancestor. It is not common ancestry that Creationists disagree with, it's _universal_ common ancestry. For vertebrates, Creationists normally find that the original "created kind" occurs at the family level. This is established by breeding experiments and trait analysis techniques.
In fact, scientists are finding that the kingdoms show almost no relation to each other.
The molecular machinery that interprets DNA is virtually the same in all living things, even in the lowliest bacterium.