I KNOW that there is a girl who is half sister to my children, my eldest wrote to her (he is 20) she wrote back saying she thinks we have the wrong person. we KNOW we dont, she is 31 with children of her own and has five half brothers and one half sister that she has no idea about.

Do we tell her the truth or leave her thinking her 'dad' is her real dad when he is not, although to all intents he has been there for her all her life ! So he is her dad ! Do we shatter her illusions or leave things be. I am so confused right now.

Or maybe I am not maybe I should leave things be and know this ?