Dave is not Charlie's wife. Fiona is cold. The grandfather of Dave is not Erin if Fiona is not Charlie's husband. Gary is not Fiona's uncle if Erin is not the grandfather of Dave. Erin is not cold if Erin is white. The husband of Charlie is not Fiona if Erin is not cold. Erin is white if Fiona is cold or Dave is not the wife of Charlie.