<human>: Can you succinctly summarize the text in 1-3 sentences?

I have no idea if this is the right subreddit to submit to but bear with me here please :)

Backstory : My parents have been in a long bitter divorce and my dad has basically been calling me and my little sister for the past few months trying to get us to say something against our mother. He has admitted before that he has recorded his phone calls with my mother before and I have beyond a reason of doubt that he's doing the same to my sister and I. 

I guess what I want to know what the legality around this. To what degree do recorded phone conversations show up in court and how do I go around this to make something like this not legally binding. 

I really don't know anything about law so once again I'm really sorry if this isn't the right place or if what I'm asking doesn't make any sense.
<bot>: What do I do if a family member is recording phone calls with me and my sister to use against my mother in court.