I honestly don't know if my mother has dementia or not. She won't see a doctor, claiming she's not 'crazy'. She's only just turning 50, but she has fits, screaming yelling stomping her foot like a 2 year old. Walks in the house and puts something down- goes outside for a few minutes comes back in yelling that someone stole the thing she put down, claiming my grandmother (her mother- who's on oxygen and can't move around well) stole and moved said object just because she can't find it. Or she can't remember things logically- claims that three adult people rode on her 2 seat motor bike over dangerous winding mt. roads with a large rottweiler puppy....this is all physically impossible and it's not even how we got that puppy. These are just a couple examples but she's gotten so bad now that she does things like this everyday to every other day. She really paranoid, say things like 'The Man'/police/government are out to get her or that she hears people around her house at 3am- she lives in sectional house in the backyard surrounded by 6ft fencing- we also have 4 dogs that wouldn't let people get anywhere near the house, much less at 3am! My grandmother can't take this kind of stress and I don't know what to do, or who to ask but typed in 'when someone forgets where they put things then yells about someone stealing it' and this site came up. Any help or just point me in a good direction so maybe I could help her and she'll stop yelling at my poor grandmother.
Get her to her Dr.
The equally important issue is that GM has conditions that are at odds with moms. You are in a tough spot. Because of her age, GM is more vulnerable. Do you all live together? Is it GM house? Is it just the three of you?
Tell us more about your mom. Does she work? Does she contribute to the household income and maintenance? Is she on disability?
Give us more information and maybe we can offer better suggestions.
With what you've said so far and by your profile I also think you should call area on aging to visit. You need help
Call Adult Protective Services for help for grandma. Or maybe a social worker, geriatric care manager could help improve the situation.