Answer & Explanation:
Fossils are an important source of information, however, it's been demonstrated that it's not enough to establish strong or definitive relations between the species. Anyway, as the DNA shows a strong relation between 1 and 2, it could lead to the possibility that these two species are more strongly related to each other. It's impossible to establish which one is more ancient but the 3 is not so closely related and could be a different branch from a phylogenetic tree, for example.