Woman says she’s Diana Ross’ niece & MJ’s love child but DR’s sister says she don’t even KNOW that woman!

Let me tell you,there is this mama named Mocienne Petit Jackson (Her 1st name sounds like Muchene "kyuk")who came out of the woodwork claiming to be MJ’s seed. Well, Diana Ross’ sister came forward and said MPJ (that's what she's calling herself, ati after her "dad" MJ...HA! right) is crazy and she don’t even KNOW that woman!

According to TMZ, the sordid Jackson family story is even more crazy than we thought.

A woman who claims to be Michael Jackson’s illegitimate love child — conceived when MJ was a minor — has filed legal documents claiming there was a diabolical plot to cover up her existence … involving murder, abduction and Diana Ross’ sister.

The alleged MJ spawn — Mocienne Petit Jackson — has filed documents with L.A. County Superior Court claiming she will surely be in line for a serious inheritance check … if a judge will give the go-ahead on a DNA test.

Here’s the story — MPJ claims back in 1975, 17-year-old Michael Jackson secretly impregnated her mother Barbara … who happens to be Diana Ross’ sister.

MPJ claims when she was 9 years old, Katherine Jackson hatched a plan to “abduct” MPJ and send her to Belgium to protect Michael’s “reputation.” She claims all 7 of her abductors were later murdered. (Don't laugh yet)

Wait for it...Now MPJ — who currently lives in the Netherlands — has decided to come forward with her story … so she can “formally claim my part of my father’s inheritance.” She also wants custody of MJ’s kids so she can give them a “more normal life.” (here is where you laugh)

MPJ (aki I just can't get enough of that....tihihihi....MPJ)also claims she was diagnosed with Vitiligo … so, there’s that. (Vitiligo is a chronic disorder that causes depigmentation in patches of skin. It occurs when the melanocytes, the cells responsible for skin pigmentation which are derived from the neural crest, die or are unable to function. ...) That is what the university of google has taught me.

UPDATE: Michael Jackson’s alleged illegitimate daughter just suffered a devastating blow to her far-fetched claims … because the woman who supposedly gave birth to her — Diana Ross’ sister — says it’s all a bunch of BS.

TMZ just spoke to Dr. Barbara Ross-Lee, who tells us she’s pretty damn sure that Mocienne Petit Jackson “is not my daughter” — adding MPJ is “delusional” and calls the situation nothing short of “bizarre.”

Dr. Ross-Lee also points out a major hole in MPJ’s story — saying it would have been impossible for her to have conceived a baby with Michael back in 1975 … because she never even met the guy.

Dr. Ross-Lee says there was a time when MPJ “was really harassing me at my office” — and was forced to have her employer contact the police to get MPJ to stop.

According to Dr. Ross-Lee, she responded to one of MPJ’s emails a few years ago to tell her she was mistaken and to wish her well.

Is Vitiligo everybody’s trump card? Anybody with a light patch on their butt is related to Mike. This story is super sketchy. (And if her paternity test comes back positive, we reserve the right to let this MPJ person to stand up again.)