Legal Question in Real Estate Law in Illinois

Yes, assuming quite a few facts not included in your questions, your father's children may have an interest in anything owed individually by your father, including his mother's house. You should contact a probate attorney for specific advice.

This will need to be analyzed step by step and will require you to bring your documentation to an attorney to consider carefully and confirm with a title search that there are not any documents outside of your records.

First, regarding his mother's house, how the deed was set up is important. If they owned certain ways, then the survivor became the owner, meaning your father. If they owned other ways, it may be that your father became the owner with any heirs in his mother's estate. You do not state whether she had a will and who she had surviving aside from your father.

Next, regarding his house, if he owned it alone, then it would pass through his estate, 1/2 to the spouse, 1/2 to the children or descendants of any deceased child. If he owned it with his wife, perhaps through a deed executed after they married, then, as above, form of ownership would govern whether she survived to it alone or with his heirs.

Other considerations may also come into play. See an attorney.