I have a grandfather who was injured about 50 years ago in a work accident. As he grew into his 70s he grew less able to move and take care of himself. At first my grandmother took care of him and he lived in their place, but they couldn't get along, so eventually my mother offered to take him in. I wasn't really happy with it but I don't think I had a say in the matter and anyway it was objectively the correct thing to do. This has been going on for about 3-4 years. I hate him and hope he dies soon. For your reading convenience, here is a list of reasons why:

Things that suck because of him but aren't his fault:

1. My brother and I have to share a bedroom despite us being both teenagers. This is generally a mild inconvenience but one of us has to take turns sleeping on the floor which isn't very comfortable (also this makes masturbating a lot harder)

2. Our college fund is being depleted because of his medical expenses (it's not so bad that it's all gone or anything but enough to be worrying)

3. He sometimes has to wake people at night because of illness and various ailments and we get no sleep

Things that suck partly because of him, but also it's complicated

4. Him being an invalid that needs constant care. This isn't exactly his fault, but he has also refused to do physiotherapy that could help him regain a good deal of mobility and quality of life. If he kept up with physio he would still have some use of his right arm, but now he barely does. And also he would be able to walk with a walker, but now needs people to support him all the time, or a wheelchair. 

5. Our house constantly smells like shit and piss. Again, not exactly his fault he has difficulty peeing and passing motion, but if he had kept up with physiotherapy he likely would have more use of his core muscles so it wouldn't be this bad. Also he shouts abuse at his caregivers when they try to give him water to drink so naturally his excretions are painful.

6. He screams very loudly whenever he's taking a shit (I'm sure it hurts but the doctors can't do anything if he doesn't drink more water) and my ears hurt and I hate it.

Things that I'm reasonably sure are mostly his fault:

7. He abuses his caregivers. This includes my mother, his daughter. He uses obscene words (in a different language that basically translate to filthy whore or cunt but sound a lot more personal (it's a bit hard to explain))

8. He injures his caregivers: while he still could walk, he swung at my grandmother (his wife) with a walking stick; he kicks out at whoever is his maid; he also deliberately puts all his weight on you while walking and tries to walk in an odd lurch which puts a lot of strain on whoever is supporting him: my dad got backaches, one of the maid's cesarean scar reopened and got infected somehow, and another one got abdominal pains.

9. He used obscene words on my then 11 year old brother

10. He calls people at night way more than can be reasonably tolerated. Like I get that he's old and sick but we literally bought him a hospital bed so he could sleep better and he sometimes (like once a week at least) wakes everybody up several times a night to tinker with the settings to tilt the bed up and down and then when people have to go to school or work on 5 hours of sleep he naps in the daytime

10a. We learned to live with this as long as he didn't do it too often but while in the month while I was taking my A-level exams he did it nearly every day such that my parents pleaded with him to stop because I needed more than 5 hours of sleep to function during exams and I swear he only did it more to the point where I considered begging the school to let me sleep in school. As a bonus shortly after A-levels were over, he became less noisy. Could be just me being paranoid though.

11. He is really religious and afraid of dying so he wakes people up at night to ask them to pray for his soul and doesn't really see the irony in this. 

12. When he's out in public he does everything to make it seem like we abuse him. (we don't. I fantasize about him choking to death but that's about it). There was once we were in this restaurant and he drooled over himself and my mom reached out to wipe his face and he screamed and started tearing up and wailing like she hit him. Also when we bring him to the exercise park, he refuses to do the exercises, starts tearing up and pleads with us to "have mercy on a poor old man" and to "stop bullying this poor old man" when we literally did nothing but ask him to exercise. 

That should give you a good picture. From a  utilitarian point of view, I think that if he just fucking chokes to death in his sleep, it would greatly increase the overall happiness and decrease the overall suffering in the universe. I recognize that having fantasies about smothering him with a pillow don't really reflect well on me and I'll probably go to hell. So lay it on me, I guess. 
