Brilliant post April 
Lookout and Mat both have birth children. Therefore neither have experienced infertility and the loss that this brings about. Neither were adopted via a 'closed' adoption and therefore did not lose their identity before having to assume another.
I do not normally recount personal experiences instead I tend to discuss adoption on the forum in terms of research, studies and outcomes undertaken by professionals but the following is perhaps a good personal experience to illustrate the point.
At about 9 yoa I went to the hairdressers with my adoptive mum. My mum had her done and then I had mine done. The hairdresser said to me, whilst cutting my hair and in the presence of my mum, that I had lovely thick wavy hair and that it was unlike my mum's so I must take after my dad. My mum immediately said "oh yes she does". I could see all sorts of emotions run across my mum's face. I never said a word. Why the lie? Why the denial? Why the secret? Where did my hair come from? Why was I unable to know? I never mentioned the incident to my mum ever and vice-versa. This was the charade which was played out 24/7 
NN,,speaking of hair/hairdressers,,,when in my early teens,I too had my " ringlets " cut off,,and my mother said she didn't know where my hair had come from. It was thick and fast-growing,and natural. Dads' hair was thinning and a different colour and mum was very dark,,and there was I---------------blonde.! So in point of fact,it's a question that a lot of mothers must ask. I used to always say that I wasn't born,,,I was invented, because I was so different from the rest of the family in pretty much every way. Even now,,I remain different from my brother.
My daughters aren't like me in character,,,but believe it or not,,people have thought that my step-daughter was my own,,as her characteristics are more like mine,than my own flesh and blood. We've always been close and I suppose because she was " there " before my own daughters were,,we'd already adopted a closeness anyway.It's also interesting to note that she has also shown as much,if not more love and affection too than my own ,outwardly also. So try and fathom that one out.