Who told you not to file the will. If you're having trouble with a sibling, you should be working with an attorney and do everything correctly. Your well on your way to the lawsuit, you want to avoid.
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Even if you assume all of your father's assets were held in the trust and that there was no need to probate the will I would still advise you to consult with a probate attorney. You are opening yourself up to potentially expensive problems later by attempting to handle this yourself.
Many probate attorneys offer no cost initial consultations.
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Hire an attorney to review the Will and Trust documents. If you are having problems with your siblings now, that won't get any better if you sell the house, distribute assets and they are angry. Deal with it now, hire an attorney.