Members of Michael Jackson’s so-called “second family” — who have allegedly threatened to go public with claims of abuse by him — claim in new documents that, when they were kids, the singer forced them to “hide” so his lawyer would not know they were staying with him.

In court declarations seen by The Post, Frank Cascio, 44, and his siblings Marie-Nicole Porte, 37, and Aldo Cascio, 34, also accuse the late superstar’s estate of coercion, deception and betrayal in trying to quiet their claims. Aldo and Porte refer to their siblings and themselves as having experienced similar “abuse” without detailing what that abuse was.

Porte claims that in 2003 and 2004 — the period when Jackson was arrested and indicted on child molestation charges not involving the family — she and Aldo were often p

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