Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information
Who is dealing with your late Uncle's Estate?
Did he leave a Will?
Who are named as the Executors?
So who is dealing with the Estate?
Which part of the Uk was your Uncle in?
Has he obtained probate and have you seen a copy of the Will?
What about Probate?
Who are the Beneficiaries of the Will
When did your Uncle die?
Did either the sister or the nephew leaving children/grandchildren?
What interest does your mother have in the estate?
Sadly since she has no claim on the Estate there is no basis on which she is entitled to ask these questions, I am sorry
However she can find out more about the property using the service here
I am sorry not to give better news
Please ask if you need further details