Femi and Omolara would refer to Kemi and Rasheed as their cousins. Since Aisha is Kemi and Rasheed's aunt (the sister of their father), her children, Femi and Omolara, are Kemi and Rasheed's first cousins.

Rasheed and Kemi would refer to Femi and Omolara as their cousins as well. The children of one's aunt are considered first cousins, so since Aisha is their aunt, her children are their cousins.
Rasheed is Kemi's older brother, and they have one aunt on their father's side, named Aisha. Aisha has two children, Femi and Omolara. In a family gathering, how would Femi and Omolara refer to Kemi and Rasheed, and how would Rasheed and Kemi refer to Femi and Omolara?

Make your response very short.