Can executor change locks on house

Hi is it possible for an executor of a will (my sister) to change the locks on the family home after my father dies. The reason I ask is because some siblings would think nothing of helping themselves to anything they want without it being discussed with the rest of the family. Things that would be of a sentimental value. None of us live at home but have keys to my fathers house. I know it sounds drastic but thats families for you.

If you mean does the executor have any legal right to do this, the answer is no.

Actually the executor does have a legal right to change the locks. If the executor has a well founded belief that assets would otherwise walk, the executor might even have a duty to do so.
I am assuming, of course, that there is nobody still living (or entitled to be still living) in the house.

Thanks for the replies and nobody would be living at home after he dies.