If your stepfather died without a Will, all of the assets in his name pass to his heirs according to the laws of intestate succession. In Connecticut, if he did not remarry after your mother died, then this is governed by section 45a-438 of the Connecticut General Statutes which can be found at this link: http://cga.ct.gov/2011/pub/chap802b.htm#Sec45a-438.htm
Under this statute, your stepfather's property passes to his children. This is true even if he has had no contact with them. An intestate estate will need to be opened in order to establish the new title to the property and your stepfather's children are required by law to be notified. This would be true even if he had a Will. His siblings have no legal claim to his property, unless all of his children predeceased him.
I recommend that you consult with an attorney to determine what your best course of action is next.
Kent M. Miller
Attorney-at-Law
Professional Genealogist
PO Box 352
Stratford, CT 06615
Tel: 203-380-2161
Fax: 866-496-4374 (toll free)
[email protected]