Hi, thank you for your question. What was the size of your father's estate and who inherited what assets?
Are you certain that your mother inherited all his estate?
Thank you for your question
My name is ***** ***** I shall do my best to help you.
In order to give a complete answer we need to know how much the house is worth and what other assets there are
It would also be useful to know how long ago your father died
Ho wold is your mother and is she in good health?
Provided your mother inherited the entirety of your father's estate then her Executors can claim his unused IHT nil rate band and there will be no liability for Inheritance Tax
Please ask if you need further details