Register Of Wills Office In Delaware

I am on a will of someone who passed in Delaware. The executor has filed what she has to at Register of Wills Office in Delaware. I am beneficiary of 50% of the assets. (just a house)

1. Do I have to do anything to get my 50%
2. What stops the executor from selling the house and keeping 100% of the cash?
3. I jave a copy of the will
4. The executor will not return my calls nor reply to emails.
5. How do I make sure I will get my 50%

The deceased is in one state, the executor in another and I am in yet another state.

I called the Register of Wills Office in Delaware and they gave me a case number and the status is that the executor is represented by an attorney located in Delaware. I called that attorney, but he will not tell me anything as he represents the executor.

I am just trying to get my 50% of the profits from the sale of the house and want to insure that happens.

Thanks