Firstly , I want your acceptance about my most sincere condolonces on the loss of your mum.I want to point out my confusion on your cool-headedness after the next day of your mum's death.Perhaps, it's contingent upon being different nationalities.I want to mean; different cultures may give different emotional reactions on the same tragedies.
By the way, you cannot get that house by inheritance.It does not matter if you have witnesses also. So the last will will still be counted in Turkey, because wills have international validity.