Do you know if the property is registered?
When and how did they acquire the property?
If the property is registered, what "deeds" are you referring to?
If the property is registered and the field is included in the registered title by way of being in the area edged red on the filed plan to the title then there are no relevant deeds.
The Land Registry Official Copies of the registered title are evidence of your ownership and are what have replaced old style deeds from when an unregistered system of land ownership was in placed. Upon registration the old deeds would have been sent to the LR, who would create the registered title and then destroy the old deeds after noting the relevant entries from them.
You can check by downloading a copy of the register for the property from the Land Registry by paying a £4.00 fee:-
If you cannot find the land in the above way then you will have to submit Form SIM to the LR (available for download from the LR website) showing the land on a map. THey will then tell you if it is registered.
If the property is not registered then you will have take action to get the deeds, first by a solicitor writing to the sibling and then by applying to Court if necessary.
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