Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
Which part of the Uk did your father live in?
was your sister in any way financially reliant on your father?
Where is the money held?
Are you aware that the site charges more for a phone call?
Just for clarity - where was the money at the time of your father's death?
Then please do not worry.
Your sister has no claim on any of the monies at all
As you have been told the Pension falls outside of the Will and it came to you as wished by your father.
It does not matter what application your sister makes she cannot make any claim on you
Please ask if you need further details