Is it considered medical malpractice that my doctor told my step grandfather in law results of my lab testing?I am going through a divorce and on...

That seems odd that your "medical history" would be
brought into court by a step grandfather-in-law? Aside from the hearsay and possible
relevancy problems, I can't imagine bringing something like that in through a
--grandfather? But then, if you were in court represented by counsel why are you asking
this question here? Your lawyer would be the person to
ask.

But, to your question. As with any negligence claim
you have 4 elements: a duty, a breach of that duty, causation and damages. What are your
damages? What is your compensable injury? If you don't have any then you have no claim.
And that assumes you can establish the other three elements which are in and of
themselves a steep burden.