Do inaccuracies in a Will invalidate it and, if so, does the previous Will then go into effect?

Question Details:

My grandmother had been living with a boyfriend that she claimed to be her husband for about 7 years. They never obtained a marriage license or had a ceremony. She recently passed, and her Will identifies this person as her lawful spouse. The Will also gives everything to her "beloved husband ...". My concern is that the Will becomes invalid because she, being of sound mind, was listing a man as her husband when he in fact was not. I worry that her wish to care for him after her death will be cause to now challenge her Will, by family members not included in it.

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