This is not really a family law matter. It appears to be a elder law matter as whether the conduct rises to elder abuse or not. The suggestion is for you to seek out such a local attorney (or at least one on a bus route) to seek specific legal advise.
As to the house matter, under Illinois law, only the Sheriff can evict you (as either a tenant or home-owner) pursuant to a valid eviction order. There is the Deed, which places joint ownership in you, that you may wish to keep handy. It can be shown to police if called by the dughter-in-law. If there is clause that creates a "Life Estate" for you, that would give further credence to not only your interest in the home, but desire to reside there as well.
If there is no such language, consultation with a knowledgable attorney will be helpful in discussing and, potentially, implementing this through the filing of an amended deed. Again, there is a need for legal consultation and your local bar association is a good starting point.
Answered on Aug 28th, 2017 at 8:34 AM