Taj, whose father is Michael's brother Tito, was sexually abused by his mother's brother, reported Ace Showbiz.
The revelation comes after choreographer Wade Robson claimed that Michael, who died in 2009, had sexually abused him for seven years.
After hearing the news, Taj tweeted, "What people will say and do for money and to stay relevant is sickening. Desperate times call for desperate measures (sic)."
"I will not sit back and let someone flat out lie about my uncle. I am writing these words knowing that the minute I press send, my life will never be the same afterwards...
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"That is how I know Wade is lying. Because I am a survivor. My hands are still trembling (sic)," he added.
Robson was one of the witnesses at Michael's child molestation trial in 2005. His testimony, along with those of his sister and mother, were said to be instrumental in the 'Billie Jean' star's acquittal.