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

Context paragraphs:
Oxypetalum: 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: 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.

Supporting paragraphs: Adenium Oxypetalum
Answer: Apocynum family,