Is there any way to find out what an original will said?

I know absolutely nothing about wills. So, I have a good question. My parents told me before my grandma died that she was leaving a lot of $ to us kids. About 9 months b4 she died, my brother met a woman (a money-grubbing one) and had a baby with her. My mom wanted to make sure that this woman wouldn't get grandma's $, so while Grandma was still alive (yet very sick & had no idea what was going on around her), they changed her will that no grandkids would receive anything from her. My grandmother ped away a couple months ago. Is there any way to find out what was in her will before my parents had it changed? Or what was in her present will?