Good morning,NN.. I know that I'm right in my own personal view.
I haven't been involved in adoption in any way,,but the next best thing were/are step-children.
A lot depends on how the subject is broached ,when a parent/s takes on a child with a differing bloodline,,,,and to me this doesn't/hasn't posed a problem at all.
In fact,my situation was possibly a more difficult one,as when I married years ago,in the late 50,s,,I also found myself with a " ready-made " family of two children at 7 and 9 years respectively.
Their mother wasn't deceased,,,she just didn't want them,. So they'd,in effect,,been rejected by their birth mother,,,which could have proved to have been a nightmare,,,,but wasn't.
We had ups and downs like any other normal family,,,and as far as I was concerned,,we were a normal family,,and I didn't give any hints that they " weren't mine ",,,but also,I didn't deprive them from seeing their mother if they so wished,,,but that didn't happen as the children didn't want to do. Neither children received a Birthday or Christmas card from their mother. The children never once mentioned about that,,and neither did I.
When my own two girls came along,,my step-children were delighted,and as far as they were concerned,they had two little sisters. Again,,,there was no discrimination and I treated all the children the same. It was never a subject that I felt I needed to remind any of them until later on in years when my own blood children understood the situation.
There remains to be contact all round,and I'm nan to lots of children now.
Both step-children had had a pretty turbulent start in their young lives before I came onto the scene,and their father had been granted full custody of them when he'd divorced. So anyone might have expected big problems regarding the children,,,but it was one of my own who gave me the biggest headache during her teenage years.
My own advice would be that unless a child asks questions,,,then say nothing.Never remind them,,nor hint in any way that " they're different ",because they're not. Thank God I've held a balanced view.
Far too much emphasis is made on children " who aren't your own flesh and blood ", and with proper parenting, it's an acceptance of another child and the job of the parent is to integrate them with the minimum of fuss,,and not to make them feel " different ". Just get on with life and the job in hand.