I think that DNA is still part of everyones identity. Its still about knowing your heritage and this sense of 'who looks like me'.
We can pretend this is insignificant, but the trouble is in doing so we damage people's well being.
Given the number of adoptees who say they felt like 'something was missing' or 'they didn't belong' and then track down their biological family and find this makes a lot of sense to them and their own story (yes even the bad stories give an understanding of that - including where adoptees ultimately don't become cheristed members of the family).
I think this is where we have caused a significant problem which will come out in years to come with regards to sperm, egg donation and surrogacy. Indeed we are already starting to see the beginning of this because sperm donor babies have those questions and are trying to find them out - or are finding siblings they didn't know about.
We have been grossly naive in this assumption that you can just 'build' a family.
It ISN'T a replacement for that biological aspect - we retain that desire to understand ourselves from our past.
A non-biological family DOES have a place for many, but understanding that this may play a different role and doesn't replace a biological one is something we all need to wake up to.
I've talked about the concept of identity formation in different contexts on MN before - we have individual identity and we have collective and group identities with family identity being one of the most important of these.
I think we will increasingly see that disruption to our understanding of family identity causes psychological harm and distress. So yes, finding out you aren't blood related matters. Or finding out you have a 'bonus' sister may not necessarily be a joyous thing if as part of that you understand there was an event that sparked that. There maybe feelings of anger and regret. A feeling that you 'knew all along why you were treated differently'. Etc etc.
The idea that we can just play happy families and live happily ever after without facing this and acknowledging this head on is frankly ridicilous.
And yes, I abbsoluetely do think that donor parents owe an obligation to their child to explain their decision making to any children they have - legal and non-legal children. These siblings deserve the right to choose what, if and relationship THEY want to have. These donor parents DID NOT just make a decision thats just on them and without implications. There are implications in terms of ensuring children don't inadvertially end up in relationships with close relations for starters. And wanting to know your biological medical history isn't a small thing either.
It frustrates me intensely that its so over looked and santised because the market for donor sperm and eggs is driven by the demands of exceptionally priviledged and wealthy individuals, usually at the expense and exploitation of much more vulnerable ones EVEN in cases of altrusism.
We are just beginning to touch on this as a whole new ethical issue and one thats only going to become more significant. Cases where men have fathered far more children than they should are particularly disturbing too.
There needs to be transparency and accountability in this area which focuses on the rights of the unborn child as well as the desires and beliefs of the parents.