KEYSHA COLE MUM DEAD, OVERDOSE ON BIRTHDAY.
biological mother, Frankie Lons, has died, passing away on her birthday after a several-decades-long struggle with addiction ... TMZ has learned.
The R&B singer's brother, Sam, tells us ... Frankie overdosed at her Oakland home Sunday ... the same day she was celebrating her born day, when she apparently took drugs while partying -- relapsing on what we're told was a long, hard-fought journey to sobriety.
Sam says he was checking in with Frankie daily, trying to help her stay clean ... a well-documented battle that Keyshia and co. had captured and shared publicly in recent years ... via television, social media and other channels.
Sam also says the family wants the world to remember Frankie as someone who loved her kids, and who wanted her children to be together ......