This movie came out somewhat recently (2000s) and is well known. It’s not a horror/slasher at all and in fact I think it’s more young adult. I was thinking it might be A Series of Unfortunate Events. I think this was just a few scenes- not the entire plot of the movie. I just can’t place this part of the film where there is a wealthy mother and son with no limbs in a fancy house or palace. I feel like the actress was someone like Sharon Stone or Emma Thompson, but their filmographies don’t seem to pointing me in the right direction. The son is mostly bed ridden and they have a servant boy. Maybe the mom has a pet monkey? I think the mom has blonde hair with fancy clothes and makeup. In the end of the scene, I think the son with no arms or legs has the servant boy kill the mom. Something like that? Again, not portrayed as horrific as this may seem.
OK, I figured it out! Thanks to your post, I added “pet monkey” to my Googling and remembered it was Ratched! https://www.bustle.com/entertainment/brandon-flynns-ratched-character-henry-osgood-the-worst
Did you ever figure this out by any chance? I came here trying to remember this exact same movie/show, and it’s driving me crazy! I also seem to recall that there were drugs involved at some point and the son wanting to take the arms of someone else? Maybe a tutor/coach/instructor of some sort? And the main character (who I think was high) thought he had murdered this person but it was actually the son? I’m confident it’s the same one – I knew exactly what you meant about it not being truly horrific and kind of remember it feeling like a parody in some ways. I keep Googling and can’t find anything, and I know it all sounds bizarre!