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While I wouldn't necessarily say that I would "give" it to her lawyer, but rather potentially use it as evidence, that would not be blackmail. Blackmail is the extortion of money or something else of value from a person by the threat of exposing a criminal act or discreditable information. Typically in a judicial proceeding, a threat to use some bit of evidence that one could otherwise use for a particular purpose would not be blackmaill
So in short, no, this would not be blackmail. Rather, it would be evidence to try to prove that they're unfit parents. You're not trying to extort money or anything of value from them, but rather show them that if they do something, trying to take you to court, then you're going to use that information in court against them.
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(one clarification: blackmail, aka "extortion", specifically assumes that money or something of value will be obtained... if you're trying to keep something from happening, that would not fit within the definition of blackmail)