You need to immediately contact a probate attorney in New York to advise you on this. You personally are not responsible, but his estate is. The IRS usually is in most states at the top of the list of creditors to be paid. You do not want to disburse or transfer anything until you talk to an attorney. If you do, and there are unpaid income taxes that are required to be paid, you run the risk of having insufficient assets in the estate...you do not want to be in that position against any creditor with a valid claim...especially the IRS.
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Debts of the decedent are the responsibility of the estate, not the children. I would suggest that you speak to an attorney in NY before proceeding further. Often to sell the house the will must be probated, but you should not probate the will in this instance without legal help, because once you become the personal representative, you will have responsibility on behalf of the estate to pay the outstanding debts in the correct order out of the estate.
You should not distribute any of your father-in-law's assets until you have an opportunity to meet with a probate attorney in New York. While you normally would not be personally liable for his unpaid taxes, you could be liable if you distribute assets from his estate that should have been paid to his creditors. A New York probate attorney can instruct you as to which assets are subject to your father-in-law's creditors and explain the responsibilities you will have as administrator of his estate.
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I agree with all of the other responses and I would simply add that, unless the real estate was jointly owned or provided for a transfer upon death, you will not be ABLE to sell it unless and until you open a probate estate. The estate would be responsible for any taxes or other administrative expenses.
I strongly suggest that you at least consult with a probate attorney before deciding how to proceed.
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