If two animals or two plants can hybridize (at least enough to produce a truly fertilized egg), then they must belong to (i.e. have descended from) the same original created kind. If the hybridizing species are from different genera in a family, it suggests that the whole family might have come from the one created kind. If the genera are in different families within an order, it suggests that maybe the whole order may have derived from the original created kind.
On the other hand, if two species will not hybridize, it does not necessarily prove that they are not originally from the same kind. We all know of couples who cannot have children, but this does not mean they are separate species!
In the case of three species, A, B and C, if A and B can each hybridize with C, then it suggests that all three are of the same created kind — whether or not A and B can hybridize with each other. Breeding barriers can arise through such things as mutations. For example, two forms of ferment flies (Drosophila) produced offspring that could not breed with the parent species.5 That is, they were a new biological ‘species’. This was due to a slight chromosomal rearrangement, not any new genetic information. The new ‘species’ was indistinguishable from the parents and obviously the same kind as the parents, since it came from them...the created kind is often at a higher level than the species, or even the genus, named by taxonomists.