1. Dear Sue, it sounds as if you are being put upon by your brother and sister. However, the solution is to simply change the locks on the house. The trust gives you the right to reside there exclusively. You don't have to allow your brother and sister to come and go when they want. If they are trustee or executors, this gives them no right to interfere with the trust property which is in the possession of you, the beneficiary of the trust. So you can exclude them as you wish.
2. Additionally, your brother and sister have no right to impose conditions on your occupancy of the trust property. You are free to do what you want with the trust property include have whoever you want there.
3. If there is a row about this issue, I suggest you get yourself your own solicitor and formally write to your brother and sister setting out the terms of the trust and asking them to desist from interfering with the operation of the trust. Ultimately, you must stand your ground and insist on your rights.
4. Be aware that your brother and sister's position as executors gives them no right to impose conditions or to come and go when they want. If they are trustees, there is an express rule that prevents them from benefiting or interfering with trust property.
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6. Dear Sue, a will speaks from the date of death. Accordingly, here the trust came into force once your mother died. It is not correct, as your siblings suggest, that they are not subject to the will until they take out probate. Your siblings are behaving badly here and you can insist that they are excluded from the house.
7. You are welcome!