Desperate need of phone records

My dad recently passed and there was a conversation about an unfinished will that he wrote. It was either my brother or his wife who told me that this unfinished will stated my dad did not want to be cremated and he would like to be buried at Arlington (since he was in the Korean War). Now, for whatever reason, he/she is claiming they never said that and it was not in the “illegal” will. I’m dealing with a lot of emotions right now...my dad and I were very close and I don’t need this now. All I need is to see the phone conversation I had so I can have the “hard copy” proof that he/she did in fact say this to me. Is there anyway I can see records of my phone calls?