Yes I am the only other beneficiary .
Then, in the end, once all the formalities are completed, it looks like everything will belong to you. Now, if for some reason they are doing this because they think that all they will inherit is debt, and if you believe that all that will be inherited is debt, then you are all wrong.
In that instance you would be responsible to sell all of her assets to put towards the debt and estate expenses, based on the requirements of the law, but if any debt is left over after that, its nobody's responsibility. The creditors just lose out.
If you are at all confused about how it all works, then you should get a consult with a local probate attorney. You do not have to spend the money to retain one, but you should pay for an hour of one's time in order to be clear on everything.