Deceased rapper Nispey Hussle's babys mother Tanisha still has major issues with his widow, Lauren London. And yesterday she was so upset, that Tanisha threatened violence.

It all popped off when a fan page posted an uplifting and inspirational video of Lauren London. And the video caused Tanisha to become enraged.

Here's the video that Tanisha was upset with:

Tanisha was so upset that the fan page posted the video of Lauren, that she threatened to fight the girl who runs the page.

Look at the foolishness that Tanisha - whose Instagram handle is chynahussle - posted online:

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Tanisha is in a bitter custody battle with Nipsey's family, over custody of their daughter.

Last week, TMZ published a scathing article about Tanisha's parenting. They wrote:

Lawyers think [Nipsey's sister] can win the custody battle for his 10-year-old girl, Emani Asghedom, by highlighting Tanisha Foster's track record with her 18-year-old daughter.

We're told the girl is currently in juvenile detention in L.A., and has been in and out of the system since she was 12. Our sources say she's in juvi now for petty theft, and nobody will come forward to claim her ... including Tanisha.

Even though her daughter is 18, we're told the detention center won't release her because she doesn't have a GED or a stable environment to which she can return. Our sources say Tanisha's been MIA most of her daughter's life and has refused to attend her court hearings.

We're told Foster also has a 17-year-old son who bounces around from home to home and doesn't attend school regularly.