NEWSFLASH! Leolah Brown, the sister of singer Bobby Brown, says she’s planning to write a tell-all book about?what REALLY happened to Bobbi Kristina and Whitney Houston.

Leolah is certainly not one for holding her tongue and the outspoken sister has often blamed Pat Houston for the demise of both Whitney and Bobbi Kristina.

[READ: Leolah Brown: My Niece Bobbi Kristina & Whitney Houston Were Both Murdered… (VIDEO)]

Now Leolah says she’s putting it all in black & white as she plans to pen the tell-all to expose Whitney Houston’s sister-in-law Pat Houston and her role in the demise of the famous singer and her only child.

And of course Leolah says she’s got the receipts! Details below…

Bobby Brown’s sister recently shared the following on?her Facebook page…

According to RWS, the article Leolah is referring to claims that Bobbi Kristina was could have been saved but instead was ‘euthanized’ at Pat Houston’s request (click?here?if you missed that).

Leolah?goes on to say that she has PROOF that Pat Houston forged documents concerning Bobbi Kristina’s guardianship…

Pat Houston has yet to shut down Leolah Brown’s explosive accusations.

One thing’s for sure, if Leolah’s book is ever published, it’s sure to be a best seller!

What do you think of Leolah Brown’s latest rant?

Believe her? or Nah?