Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
When did the father die?
Are you aware that the site charges more for a phone call?
Did he own the property he lived in?
Ok - is there a solicitor dealing with the Estate at all?
It is not your daughter's responsibility to Clear the house (unless she wishes to do so)
There is no way that the house can be sold yet - Probate will need to be obtained first.
If she is being asked to carry out what is in fact the responsibility of the Executor then it is only reasonable that she is shown the courtesy of being told the contents of the Will - and possibly asked what items. if any, the children would like to have.
I suggest that your daughter politely tells her former sister in law that whilst she is willing to assist, as mother of the deceased's children, she needs further information before she does so - including what is to happen to the assets and what provision has been made for the children.
Indeed she is entitled to ask what provision has been made for the children since if none has been then an application will need to be made to the court by way of a challenge to the Will.
I hope that this is of assistance - please ask if you need further details