You need to have a local attorney advise you about any homestead rights she may have. Absent that issue, if owners of a property cannot agree on what to do with it, it is called a partition or forced sale.
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If she is named Executor, and then drags her feet, you could Petition for an Accounting to force the sale.
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Since upon your father's death, assuming his will reads as you indicate, your siblings and his surviving spouse will be tenants in common of your father's house, you would have to commence a partition action to force the sale of the residence.
I'm not so sure I agree with the others (yet). Nobody has asked and you have not yet said how title is currently held to the property. Is his current wife in title? If so, depending on how she holds title, she could become the sole owner by operation of law despite the Will. We need more information before anyone can advise you properly. Ultimately, you should probably retain local counsel, since as you can see, internet minds can vary.
I may be guessing or not licensed in your state. No atty/client relationship exists.