Dave is Charlie's wife. Gary is not Erin's son. 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. If The wife of Charlie is not Dave or Gary is Erin's son then Erin is not white.