Re: Can my sister keep the family home?
Under the terms of the will it appears you are entitled to one third of the house each - it would be included in "the rest". Get the solicitor to clarify this
One issue is when your father died - was it over 12 years ago? If it is, your sister may be able to statute bar you interest in the property anyway. It all depends on facts, so ask the solicitor if there is any possibility that your sister has obtained a squatters title to the house.
What title did your father have to the property? There's always the possibility that he only had a life estate which he can't distribute under the will.
Another issue is the Revenue implications of going with their plan.
Find out about insurance requirements etc - Legal title vested in you as executor, so you bear some responsibility for the property. Find out exactly what the implications are.
You also need to do a bit of a tot up - is 1/2 of the land (less site) worth more to you than 1/3 of the house and land (less site). If there's a loss on your part you may want to request your own term of payment of some amount of cash. That might change their plans a little.
Also have a bit of a think before you go in - is it fair that your sister should be able to live where she has lived for the past several years? Wills are often disregarded to a greater or lesser extent by families through the mechanism of a deed of Family Settlement, often for the reason of fairness. Legal rights and the right thing are not always the same.