Prove they are descended.
All you have is a hypothetical cladogram which is nowhere near logical proof. Bare in mind only logic allows your theory to proceed.
This type of evidence that "follows" if evolution is true, is very weak, as you merely have to believe we are related, when the facts themselves do not insist this is so.
the proof they descended would be in their accurate ability to make predictions.
29+ Evidences for Macroevolution: The Scientific Case for Common Descent provides a good synopsis of the large body of evidence and predictions that evolution can make. Tell me, how does one test creationism? What predictions does the theory of creationism make that can be tested against reality that evolution would not make? The most important part of any scientific theory(and this is a science forum) is that it can make predictions by which the theory can be tested.
What predictions does Creationism make?
How have these predictions been tested against reality?