Former United States President, Barack Obama’s step-mother, Keziah Aoko has died at the age of 81. Aoko, who is the mother to Obama’s half-brother, Malik Abong’o Obama died on Tuesday, April 13 while receiving treatment at a UK hospital. The deceased is survived by four children; Malik Abong’o Obama, Auma Obama, Mustapha Abo and Sadik…