TRP I need your advice. My parents marriage of decades is falling apart.

Background: My parents immigrated from a 3rd world country back in the 70's. They married and had a typical husband works, wife raises the kids partnership that has lasted almost 4 decades. Growing up my dad was the stern hard worker and provided strong guidance as I grew up.My mom was a great mother and teacher. Always cooked, cleaned and took care of us.

A couple years back my pop retired after the last of us finished university. My mom was pretty concerned and worried about money but there was no need. My dad had more than enough money and a retirement plan. He went through with it. With my dad home, things started going slowly downhill. My mom started to talk down to my dad more, asking him to do favors all the time and he would willing do it, like a puppy. This wasn't the stern man that I grew up with. He has become more and more a servant to my mother and she exploits and treats him like shit.

She gets a look on her face like shes crazy and she transforms from that awesome mom that I had to something else that I don't know. I'm not a religious man, but she looks like something out of hell with that look on her face. My dad, when he is just with me, he is like his old self, but with her he changes too. From rottweiler to puppy. It scares the shit out of me. It's like out of a horror movie how their faces and behaviors have changed. It's nothing like what I remember from my childhood. TRP changed my perspective and what's happening with my parents has damaged my psyche.

I need advice. I need someone to talk to. The world I thought I knew is crumbling.

TL:DR:My father who was my guiding light all my life has become something else and my mother has changed to something out of a nightmare.