It is not a pleasant thought to think of your demise. However you should plan in advance regarding your estate so the affairs are in order in the unfortunate event of your passing. Your property in Thailand becomes of value once you sign the contract and make an initial payment; hence even before the transfer of the property you will have an asset to consider for your estate planning.
For more information, see the link below:
http://www.siam-legal.com/legal_services/thailand-will.php