A few things like the eye seem to have arisen independently in more than one line. Insect eyes, for instance, are very different from ours. Mostly, this is easy to spot although there can be problems if all you have are fossils.
Here's another point you may not be considering. An innovation, mammary glands, appears in one place on the tree. Can it move down? Can it move to the side?
Where can you find it later on?
You're really forcing me to delve deeply into this evolutionist's mode of thought. I shall continue, but only for a little while longer. As I said, I just wanted to play with your challenge, not to change my worldview. Anyway, if the genetic material from which mammary glands originally developed (mutated, whatever) is present in the "tree", wherever that may be, I suppose the potential exists for such material to be expressed again, although in a different species. I just don't know. Well, yes, there's the platypus, isn't there. I suppose, if the platypus isn't a separate creation of the lord, then it's a separate expression of the same mutated genetic stuff that resulted in mammals. Clumsy explanation, but probably acceptable to an evolutionist.
What, besides insanity, do you inherit from your children?