I have a sister who has a grown up daughter and, although they both now live in a different country to me, we are all still close and talk every week or so.
Other than a few distant cousins we don't have any other relatives, and so the family relationships are understandably very important to my niece.
My sister is divorced from my niece's father who went on to re-marry and, although through the years he has chosen to have no contact, my niece has remarked on more than one occasion that she would have been very happy if he'd gone on to have more children, then at least she would have had (half) siblings. He didn't have any other family.
My niece is a great girl, leads a very full life, has lots of friends and sees her mother regularly, but I know for sure that she sometimes feels sadness at the 'lack' of relatives in her life and is a bit phased by the 'smallness' of our family.
Knowing this, I find the secret I keep have carried for years almost too hard to bear. It is not 'my' secret.
When she was just fifteen my sister had a child which was given up for adoption. This was arranged by my parents and no one ever knew. Six years later my sister had re-built her life, married, had my niece and still no-one knew (so not such a big age gap). It was only around the time of the death of my parents that I found out by accident.
I have spoken with my sister about this and tried to support her in every way I can. Obviously she will always grieve for the baby she gave up, but she has built a stable life and has a very good relationship with her daughter, my niece.
She does not want to tell my niece nor does she want my niece to be told that my niece has a (half) sibling somewhere in the world. She will not consider it, won't discuss it and becomes distraught if I try and get her to at least consider talking this through with someone.
I am worried that if I push too hard this would tear my sister apart.
That should be the end to the matter. It is not my secret to tell. But even so, it is a secret that I have to carry too. A secret I have to keep from my lovely niece.
I believe my sister has got a right to keep her secret and not be subject to pressure from me or anyone else.
BUT
I equally believe my niece has got a right to know that she actually has got the longed for sibling somewhere.
I think about this every day. Is there an answer.