wymondham2 - I think what smouse was trying to say is that when you get down to the last few "unsolved" parents and children, it is a process of elimination. If you are confident that the rest of your answers are correct, then it should be a simple process. If not, logic has it that one or some of those already answered must be wrong and it's back to the drawing board.
As I said on here earlier, there is more than one way to look at this quiz. Look at the mothers and fathers, see who they were "with" and then see which children they produced. This is an extremely rewarding quiz when you complete it, more so if you do it by yourself and don't ask for answers to be given away on here.
I myself, made an elementary mistake fairly early and then had to revisit when I realised near the end that something was wrong, but I got there in the end - with immense satisfaction.