Oxypetalum is a genus of flowering plants in the Apocynaceae family, first described with this name in 1810.
 The genus is native to South America.
Adenium is a genus of flowering plants in the Apocynum family, Apocynaceae, first described as a genus in 1819.
 It is native to Africa and the Arabian Peninsula.

Question: What family are both Adenium and Oxypetalum a part of?
Answer: Apocynum family,