I mean learning to walk in line. Doing class work. Sitting at a table. Putting trash in the can.
You know basic stuff.
Kids with anger issues, abusive families, gang affiliation are clearly not what is going on in this house.
But, you know? What do I know about it?
I just hope they get it sorted out.
My grandkids are really good at school. My gd 11 gets bullied and nothing gets done about it. My gs 10 is good at everything, is a turd at home (hyper sensitive, extremely picky eater, mouthy, etc.) at school he’s a model kid. 6 year old gd. omg is soo cute and tiny, 15 year old gs has some issues, but nothing odd for a very bright adhd kid. I hate to be too hard on them (though trust me I am) 'cause they’ve been through a lot. When we left our rental house and moved here my youngest gs was so upset that we left that house. It felt like home to him. He still cries sometimes when they drive by the old house. There is more erm stuff but I’ll refrain. Suffice it to say that there is a lot of stuff the “rents” have done regarding the kids that pisses me all the way off. Not abusive, no but ill thought out and stupid.
Punishment and negativity are not the only ways to instill discipline. You are reading from an old piece of music. No one is suggesting that the OP leave the situation unaddressed. We are suggesting that she change from old-fashioned tactics which haven’t worked, to scientifically proven principles which may.
I am sorry that your parents didn’t have this information available to them. Mine didn’t either. But we have better options now.
Adding to the trauma will not help this situation.
Small wins add up to big wins, announce your intentions to finish the bathroom, ask for help if only to watch and be ready to call 911, 
clear an area to work get your supplies ready and go at it.
I’m an A+ procrastinator too. I have two bedrooms that need clearing out. One was the leftover mess from one kid moving out the other is our so called storage locker full of stuff I don’t even know all that’s in there.
The storage room has been like that two years. The other room since January well longer but she moved out in Jan. I couldn’t go in there as it triggered me to rage. Trash dishes clothes art messes. My spouse cleared the trash out. This week finally I decided I wasn’t waiting until I was too old to care, I want those spaces back this year dammit! I bagged up the clothes, many with tags still on them, threw out more trash, found some of my dishes and cutlery, emptied boxes, organized and finally it was cleared out and I was able to vacuum the floor! Took two easy days that’s it! Carpet is trashed but it’s going to the dump anyway. Cleaned the windows and I’m amazed. I keep going in there just to look around.
Now I’m starting on the storage room which will be much easier so far I’ve found a bunch of empty cardboard boxes and empty bins. I’m making plans for these rooms, one a guest room the other gets morning sun so it’ll be a nice nook for coffee reading yoga quiet.