Kind of. I simply told my sister in law that my brother abused me. The evidence could be found through lie detector tests and testimony from me and people that knew about it when it was happening. I am not sure what other evidence would be needed. If a child was abused and it was reported a year later the same evidence would exist, would it not?
You're missing one important point. You stated earlier that "One friend I still have a little contact with and he attempted it on her also. "
So there IS some additional evidence.
So any child who does not immediately report their abuser can not bring any legal action against them? How exactly does telling someones wife constitute defamation of character?
In most states, there is a statute of limitations that limits how long after the incident you can still report it. Child abuse is very long - sometimes well into adulthood, so your first statement is wrong. You CAN bring legal action against them many years later, as long as it falls within the statute of limitations.
The question about defamation is trickier. Since you have at least one witness who says that he tried the same thing on her, you're going to have a defense here.
Defamation is defined here:
What Is Defamation?
Unless he's a public figure of some type or has a job which relies on his reputation, proving defamation is going to be difficult. In addition, truth is an absolute defense - and you have one other witness.
Equally important is the statute of limitations. In ID, there's a 2 year statute of limitations. That means that if he has known you said these things about him for over 2 years, he can't file. For that, you COULD use some of the other witnesses. As an example, if your mother heard you making those accusations against him over 2 years ago, then he would have had to file within 2 years of the time you made the accusations.
Personally, I wouldn't get too worked up unless you receive legal papers - and if you do, go see an attorney ASAP.
Meanwhile, stop talking about him. There's no reason to.