Estate Law Questions? Ask an Estate Lawyer.
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If your husband has a will, then his assets and property will be distributed per the terms of his will. Thus, he can set everything he owns to go to you upon his death and exclude his children, or only leave them specific property, etc. Thus, the simplest way to direct what will happen is for him to get a local attorney to draft a will that comports to his intentions.
If there is no will, then property is distributed through intestate succession statutes, which you can read about here: http://www.nolo.com/legal-encyclopedia/intestate-succession-indiana.html. Under Indiana law, the surviving spouse gets 1/2 of the spouse's property and 1/4 of the value of real estate, and the children divide the other 1/2 equally).
Also, any joint property you own together could be impacted because his interest would be divisible under intestate succession laws as well.
Thus, it is certainly in your best interest to have wills that specifically state how or what will happen to the property upon death.