Based on the popular book 'Ladies Night', created by Christian Keyes, who also serves as a writer for 'All The Queen's Men'.
Even though she plays his aunt, Eva Marcille and Skyh Black are only 5 years apart in age.
Eva's career took off after she won Season 3 of America's Next Top Model in 2004.
According to BET's site, Madam ("All the Queen's Men") and Fatima ("Zactima" and "Sistas") are cousins. This further indicates that all three shows exist in the same universe.
Dion Rome plays EL FUEGO in both "ALL THE QUEEN'S MEN" and "SISTAS" (both as an exotic dancer). This is a clear indication that both series take place in the same universe.