APS won’t help because they have been threatened so many times

I need some help/advice on what to do. I’ve never made a post on here but I dont know what else to do.

So my fiancés grandma has bad dementia, she is living in her own house with aunt and uncle. Uncle is super violent, has been in and out of jail in multiple states for aggravated battery, assaulting a police officer various other charges. Aunt is legitimately crazy, like been in mental wards, doesnt work and wont drive a car over 40 mph. These too adults in their 50s are “taking care” of grandma. Grandma is being seriously mistreated, grandma wont remember to eat or to shower and aunt wont make her bathe in any way. Grandma has to wear depends and often will sit in her own filth for a very long time. Grandmas house is severely hoarded, there is tiny pathways to get from room to room. They haven’t had a working refrigerator in years and the three of them pretty much live off of fast food because they dont have a fridge and since grandma cant remember when to eat sometimes they only feed her once a day.

Right so with the stage set, my fiancé, my fiancés mom, me, neighbors, and other family members have called Adult Protective Services. APS has been many, many times to the house and everytime uncle threatens them with physical violence and tells them to leave. This has happened so many times that APS wont go to the house anymore. We’ve had police do welfare checks and they get the same treatment. All of this has lead to fiancé and fiancés mom having to get no contact orders and restraining orders against the aunt because the aunt has been harassing them to try to get them to stop calling APS. The aunt has shown up to both fiancé and fiancés moms work to try to get them fired. Every time anyone contacts grandma she says shes fine because she doesnt remember or know what’s going on.

Basically like what else can I do if APS wont get involved, it’s hard to get police involved now. Essentially we need to get grandma into some sort of living arrangements where she can get the care she needs.

Location: MN