My dad is getting out of prison

I am really really disappointed in the justice system. Me and my family went through hell in May of 2021. A lot of you followed my post but I had walked in on my father molesting my 13 year old son. I found out he had sexually abused my brother for years and my mom knew he sexually abused my brother. She would just tell my brother to stop crying and my brother left home the second he could and lived pretty off the grid at in the woods. I also never mentioned this but after therapy my son did confess that he wasn't just molested and my father raped him on several occasions. The only good that came out of everything is that I have my brother back in my life and he's been a great support for our son. My brother called me to tell me to sit down when he tells me this but he found out our father got approved for parole. Which makes no sense to me. He got sentenced to 8 years. He has BARELY served 3. How is he getting paroled already. My brother told me good news is he won't be near by. Him and my mom are going to move out of state because they're worried he will be chased out of town. We did speak to my son about it and he showed no emotion and just said okay. I asked was he okay. He said yeah he's fine and he's over it. We have been working on our relationship because for the longest time after I was extremely over protective and he was telling me in therapy he needed space. He hasn't been to therapy in almost a year and has been doing fine. This morning he he was in the laundry room. As many of you guys know when I walked in on my father molesting my son it was bc he randomly started wetting his bed out of nowhere. I went to wake him up and my dad had his hands down his pants. He hasn't wet his bed in almost a year. He had that morning and was trying to clean it to hide it from me. I asked was he okay. He said yes and wouldn't look at me. I told him I would clean it. I asked if he wanted to talk to me and he yelled at me and told me he's fine and to get the fuck off his back and left the laundry room and also slammed the door. My daughter asked him what was wrong and he yelled at her too. I'm thinking maybe I should put him back in therapy. I know he said he's been fine but I think he needs it. All of this also made me think... I have a cousin who is STILL serving a 10 year sentence for drug possession. He was an addict. Luckily he's sober now. The only victim was himself and he's still serving that. How does someone abuse a child and get approved for parole in 3 years on a shitty 8 year sentence. It makes no sense. I know I'm at least going to go back to therapy because I feel my overprotectiveness creeping back and it just made my son feel suffocated. But I do think he maybe he should go back as well.

Edit: My only theory on why I wasn't contacted is that I could have been but my phone registered it as spam. That's happened with my auto insurance company and my therapy office. That's the only possibility I can think of. My voicemail has been full for a while because I was going through stuff and was failing to check it. I went through all of them and nothing about a parole hearing. Maybe it was after my voicemail was full but that is my only theory on what happened.