More information received and now I'm completely at a loss as to what to do.  The property was quick claimed to the brother and sister in 2006  for consideration of 1 dollar with life use for the father retained. There was no gift tax return filed. The father went into a nursing facility in 2010. The property remained vacant for 2 years as it became apparent that the father would not be returning the children decided to sell the home. The  life use was removed and the property was put up for sale.  Property finally sold in 2018. Proceeds of the sale was split between the brother and sister. A 1099-S was file showing the proceeds received by each. (The closing attorney will be providing a copy, but I have not seen it).  How do I report this?