My mom recently passed suddenly and my grandma took over possession of her things and accounts and claims my mom signed a will. Advice?

This is confusing. I wonder how old you are.

First, any POA in effect is now null and void. As are any guardian or conservator papers. I don't understand the "end of life" stuff. She is gone what does it matter. And "died suddenly", she was on Hospice. That means she was terminal.

Seems to me Mom made Grandma in charge. Told her what her final wishes were. Why did Mom not talk this over with her children? How much were her children involved in her final days?

If Grandma is Executor to the Will, she is not obligated to show it to you. At the time she probates it, all beneficiaries and interested parties will get a letter informing them that the Will has been Probated and is now public. At the time a copy can be sent with the letter or requested. Probate is not an overnight thing. Final bills have to be paid. If Mom owned a house it has to be sold. In my State probate can't be closed for 8 months. An accting has to be done and Okd by probate. Once that is done, then the estate will be split by the terms of the will.

I had to smile when all caps are used. I didn't realize when you used all caps it meant emphasis or yelling. I've used all caps in the past because it was easier for me to read.

Sadly, a lot of feelings are hurt during this time of mourning. Check the state you live in and google to see what your rights are if you can't afford an attorney. I'm so sorry for your loss. Great memories go a long way to help us heal.

This post is very confusing to me. Can you please share a bit more?

The usual procedure is to allow a decent interval before you think of getting lawyers involved; settling even a straightforward estate can easily take a year. When did your mother pass away?

I'm a bit revolted by the idea of badgering a woman who has just watched her daughter die about a piece of paper, I must admit. If that's unfair for reasons you haven't gone into, I apologise.

Is anybody else on better terms with your grandmother and able to discuss arrangements with her?

Consult an attorney. And all caps is very hard to read to say nothing about there is no reason to yell.