Tia Kemp, the mother of Rick Ross's 13-year-old son, William Roberts III, took to social media to call him out (again) for not seeing his son.
Ross proudly announced the birth of his youngest son, Billion Leonard Roberts, on social media earlier this month.
Ross and Briana, 35, also share a 1-year-old daughter, Berkeley Hermes, and he has a 16-year-old daughter, Toie Roberts, from a previous relationship.
But the 42-year-old former corrections officer has no contact at all with his eldest son, Lil Will, a 6-foot tall football star in middle school.
In a series of since-deleted posts on her Instagram page, Tia called out the rotund rapper for not seeing his son, saying: "Call Ya Son!"
"LAST TIME HE SAW U, U WAS N THE CARDIAC UNIT.. U WASN'T AWARE.. CALL YO SON! LIFE IS SHORT.. GET DAT HATE OUTCHA HEART! DAT SH-T WILL KILL U!"
Tia, who released a track on iTunes last week titled "Granny Gang", continued with a personal message for Briana: "Grannny Gang message.. 2 + 2 = 4!"
The simple maths equation was in reference to Briana's four children -- 2 from a previous marriage, a son and daughter ages 15 and 17.
Briana, whose real name is Candace Ray, reportedly hides her 2 older children because Ross doesn't want the world to know about her previous life, which included non-traditional work to support her kids.