I agree with Bebop. I don't know that being a milkman's child is likely if you were #5 or, if you were and you were put up for adoption, it's likely your biological parents split or one or both may even be dead. In any event, they'll have a lot different outlook on life than they did in 1965 I bet :-)

I think biological parents must always wonder what happened to their child, if s/he came out "all right", etc. and you could work okay under the guise of wanting medical background if things don't look too good on the social/emotional front?