Hello and thanks for using Just Answer.
My name is ***** ***** am happy to assist you with your enquiry.
I note that your Father left a Letter of Wishes explaining he would like his wife to be given sufficient time to find somewhere else and 5 years is more than sufficient time!You should perhaps just double check the Will to make sure there is no provision stating that the house should not be sold for however long your step mother wishes to stay there.
Looking ahead, if you wish to sell the property and the son wants to rent it/buy you out, then the following scenarios can happen-
1. He buys you out of the half share. This would save on Estate Agents fees, and the value paid should be calculated by getting 3 valuations and picking the middle valuation.
2. You are entitled to apply to Court to obtain an Order for sale on the basis that you own half of the property- ie you can demand that the house be sold.
3. You agree for a Sale to take place.
Therefore, you could force a sale, although it would mean you having to go to Court.
Hopefully, the mere threat of such action will hopefully make the son see sense.
I hope this helps you and sets out the legal position.