I have 2.
My grandfather: Abused my grandmother (lovely woman who'd give anyone her last pound even if she was starving) in every way possible - physical, emotional, financially and more. The world owed him a favour and a living without him having to do anything for it. Everything was everyone else's fault. He wanted everything but didn't want to do/work and was so angry when my gran got what they called a green card for being disabled and medically retired and he had to still 'sign on' (he did everything he could to lose his job everytime he got one). He then gave her ten pounds a week from his wage to pay for everything in the house - all bills, food, clothes etc and kept the rest of it for alcohol. When she went into hospital for 6 weeks (three times - one my mum, the other two she sadly lost) to have her babies he gave her usual ten pounds to come out to each time to pay bills (having not paid any bills whilst she was in hospital and had drunk all the rest of his wages. he couldn't be trusted to look after mum so the 2nd and 3rd time she'd gone in she'd had to stay with family. He left their dog so long that the poor baby curled up and pined away in a corner and died :( ) He could never do wrong and accepted no blame. Once told a priest who called to the house to ask why he hadn't come to the church in a while that he couldn't go as if he'd 'see anything he wanted, he'd just take it no matter where it was or what it was'. He stole lots from said church when they took him back. Also stole from charity shops and our families homes. The day that the 3rd baby (2nd that she'd sadly lost) was buried he threw a letter at her (that was written in medical language of the day telling them tactlessly that their DNA did not mix and to not have another baby as 2 had passed) telling her to leave because he 'couldn't put up with her tears anymore.' He also let her bring home a baby whose mother didn't want him and whose grandma had begged her to adopt him (she was a born mother/grandmother who worshipped children) and live with him as her son for 2 weeks. Then when it came to it he wouldn't sign the paperwork to formally adopt him (different times back then) because 'his friends said that they'll take the child back when it hit 18 and any wages it made you wouldn't get'. Mother got the child back, took him home and drowned him within 2 days. He was tolerated for grandmother's sake until she passed away and then cut loose by all but my mum (not by choice - by duty of care). Once in a care home he died unvisited from Dementia a couple of years ago. [His entire family were the same - so very strange. His aunt asked my gran if 'she wanted to lose that baby?' (after she'd already lost one ) and of course she was in shock and stammered no - so she said 'i won't ask you to move a (heavy solid) wardrobe then.'...).]
2nd is my next-door neighbours live-in boyfriend. We have lived next door to her for 25 years in total. For 22 and half years we got on like a house on fire and were very neighbourly and friendly with her and her husband and gave her lots of things we were getting rid of for their house and also helped and advised on things when asked. Sadly 22 years into this her husband passed away. We helped support her through this. 6 months on this man appears having moved in and instantly blasts his music loud at all hours, bangs on the walls as you're nodding off to sleep (as well as during the day/evening), shouts stupid noises (like Yeeeey-ooooh! and 'wheeeeeeeeeeeeeeeeee' or) makes fake exaggerated sex noises and bragging about how good he is and then screams (yes, screams) that 'next door will be complaining!!!!', Christmas he spent hammering on the wall every few minutes. Last summer a letter was sent to the house from apparently one of his exes that got thrown into our garden (I assume he'd told her it was from us as a cover) and then he took to the wall with a hammer from 8pm to 10pm solidly. She now barely speaks to anyone else and we think he's controlling her but she keeps taking him back!
We've heard from others in the neighbourhood that she's told them (when they've had an argument) that he's had kids with three other women that he's now not allowed to see, he's broken family court orders and attacked his exes and their property (he once destroyed her car 3 months after she'd given birth to their premature child who was back and forth to the hospital at the time). Apparently, each relationship ended because he cheated on them and was using apps and facebook etc to speak to other women. During one of their frequent AND LOUD rows we've heard that he's done this to her too.
She's thrown him out three times (each time back within a week) last time after a row that told him he made her not want to come home but she had nowhere else to go so couldn't leave the house - even though it was hers... and she still took him back a week later. He's such a catch (!). There's so much more that he's done too - this is just a snapshot. The council and police have been involved too but due to the pandemic (and the fact that the woman at the council place is rubbish and doesn't reply to messages/voicemails/calls/emails and even doesn't reply to the police messages (!) it's still rolling on.)
As I write this they're eating in the garden and want to hear some music... so the music is blaring from the front living room, through the middle room, through the kitchen (where they have an alexa... we know this because when we're heard in the garden he turns the (new gen so v loud) alexa up to 10) and out to the garden so wherever we are in the house there's no escape.
I realise this is poorly written and the grammar etc is terrible but just typing it out is so bloody cathartic and a bit like therapy, especially with the noise booming through my house right now.