If there is an irrevocable trust, that usually governs all of the property that is named in the trust; it is possible that the vehicle was not placed in the trust, which is why the request would have been made for the signature on the title. All potential heirs are entitled to a copy of the will; if the attorney refuses to provide it, one can bring a motion to compel; generally the potential heirs (ie children) are allowed a copy to ensure that the testator's wishes are being complied with.
Under LA intestate succession laws (these apply if the property is not held in trust, and there is no will), the children are entitled to the decedent's separate property. For community property, under "usufruct", the surviving spouse is entitled to the use and possession of the property during life, and then it reverts to the children.
There is certain property that passes by operation of law (without probate or a trust) and that is such things as jointly held property with a right of survivorship, a pay on death beneficiary account, and life insurance policies naming a specified beneficiary.
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Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.