So step mum - you wrote something smart above
You're right - that is nice - but who cares. So what you're right yay for you... Well intentioned sarcasm. I can not emphasise this enough. If you make your case about proving mum lied on this date and mum did this and that you are literally throwing the baby out with the path water.
So you mentioned you're worried about them believing the lies. If you make the case about proving her lies are wrong - SHE WINS even if her lies are wrong. WHY? well you're showing that you're combative - She is showing she is combative. That is not a good situation for co-parenting.
It is the law.
The complex version
Family Law Act 1975
pg 204 - Section 65dAA
The best bit? The simple bit is quoted below
(c) the parents’ current and future capacity to communicate with each other and resolve difficulties that might arise in implementing an arrangement of that kind;
That is the legislation - the law. So you prove you can communicate with her - that you can resolve difficulties that might arise. YOU WIN Or you spend your time worrying that they're gonna believe her lies and focus on being combative. Nowhere in the legislation does it say you win by proving she lied...
I get you're worred they will believe her lies. Do you think these people are stupid? Do you think they get to hold the position of being a judge by chance? or by brains? Don't you think they know the decisions they make will impact on the life outcomes of these kids. Too bloody right and they take their job seriously.
Im a teacher - every year I tell my year 12 students JUST ANSWER THE QUESTION in the exams. Every year.... And every year in exams they explain what happened in the novel. They have quotes and explain that this was a metaphor or that was symbolism... All very good. But they don't answer the question. Trust me I'm going somewhere here.
You need to look at the legislation and ask yourselves are you addressing the legislation in a way that PROVES you guys are great parents? If you do that they you will win. OR are you PROVING she lied. Which form of PROOF is more important?
Let her paint her picture. I'm betting her picture will be unreliable, inconsistent and full of BS. So since I'm feeling all metaphorical and English teacherish.... oops. The jugde is an art critic. He has to decide which painting he likes better. It is not your job to show the judge that the other painting is without style, ugly and done using finger painting..... your job is to paint a great picture and let him/her decide which one he likes....
Your thread is full of she did this and she contradicted herself when and the avo was a lie. So what?
So I'm giving you a gentle - and well intentioned kick in the butt. Now go find the nearest yoga place learn some breating exercise and hang with Budda and Yoda (I love when I can get starwars into my writing). You need to use the force and the force is the legislation. Use the legislation Luke... May the legislation be with you...