I am Illinois resident about to get married in couple of months. I have assets and property that I had purchased and want to keep it separate after marriage as its a joint venture where a friend of mine is 50% partner. My question is can I keep the property and assets separate after marriage ? Do we need a prenupital agreement to make this clear and without any abiguity in case of unforeseen circumstances? What is Illinios family in these circumstances? Please advise.