Ok that was getting long.
This article is a good review if it wasn't one you read. It briefly covers problem behavior as well.
Pet bird and parrot behavior information.
lafeber.com
My first post, all those things should start helping screaming as well. Your bird had a lot of changes, new home, new husband, new routine, loss of buddy( your dad) any of those can start an issue, then unfortunately a cycle was started, and a lot of stress and frustration for all involved. But hey we are starting over!
we are going to fix this!
( note, if you feel you aren't able to take the time, effort, and patience to get past this. Then I'm not going to make you feel shamed for re homing. I've seen what un happy people and parrots...and then parrots getting shoved outside, back bedrooms, ect...and I'm an advocate for the parrot )
Ok this is the general first starting place for behavioral screaming, maybe you have already been here done that, but for most situations it drops screaming by 75% right off the bat. And I don't how many people will find and read your thread.
Cage. Largest possible. My recommendation 32 length, 19-24 wide, 30-36 tall not including base. If yours is smaller and you can afford brand new go for it. If you are like me, then take your time searching for a nice used one, they are out there, just takes time to find them. Try Facebook marketplace, Craigslist, used furniture stores, yard sales, some pet stores have them in back if you ask them if they have any used( found a great one that way, as well as the others I listed, I slowly got 4 matching ones over time) I prefer white, let's most light in. I prefer flat tops, I set acrylic sheet across tge top, then easily can attach perches, set out bathing bowl, veggies plate. Ect.
Cage set up, in main part of home, back against a wall.. several kinds and types of perches. At least one perch as big around as your fingers making the ok sign and then spread apart an inch. You can have one or two that go the whole length but offer several short ones as well. Try and maximize the burd using the whole cage or as much as possible, observe and tweak . Will just say 5 toys , ( we have many DIY threads on toys)and more on the outside. Different types, easy to chew up, gcc like to untie knots, so burd safe leather strips tied loosely, maybe a new shoe string with metal or plastic end cut off, bird bagels, Cage shereder/ weavers, lots of kinds out there play around and cater to your burds preferences.
I consider the cage home base, and easy to turn into a play station by attaching stuff to the outside sides and tops. And why waste the space above the cage! I use ceiling hooks ( rated to take some weight) then I tie heavy weighted fishing line to hang down just sbove the birds head height when standing on cage top, swings, burd cargo nets, rope spirals, or stretch out those that have metal inside so keep shapes don't sag. All along I attach cut up pieces of chew toys, foraging stuff, treat cups ect.
Then I think its important for them to have a couple of placesif their own, with their own "furniture " to hang out, maybe one by a window, buy your favorite chair, in your office. I again use ceiling hooks and fishing line to hang at comfortable height, because its cheap, doesn't take up floor space. I out a long one over my kitchen bar, one by my sliding door, one next to my chair . This firstly keeps them off my furniture! It works! Plus they can hang out be a part of things, feel they belong , indirect attention, don't have to always be in me, get to fly between and self directed choice. Also have chew stuff attached.
Out if cage time , as much as possible, make them part of your life. Minimum 4 hrs a day, ones with behavior issues trying for 6. Try for at least a half hour before you go to work.. at least 1-2 hours direct attention, the rest can be hanging out near you while you do stuff, with random hellos and treats. But more is better.
Baths, I offer daily a shallow dish , I use casserole dishes, with a couple of inches of water, their choices if they want a bath, occasionally I mist them, spray fine above them let the mist fall back down on them.
Food. If they aren't eating a wide variety of fresh veggies, as well as leafy greens like romaine, Swiss chard, bok cho, sprouts, occasionally cabbage , ect, 10% fruits , berries, pomegranate, mango, ect light on apple, very rare grape, occasionally nuts , walnuts, pine nuts, Pistachio, almond... some soaked and cooked legume it whole grains, lots of lists of psrrot safe foods, and even for those who like chop recipes.. quality pellets, and seed mix..
).
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go off. Made them warm dinner, made a big effort today what a difference. 
