Here's a very lovely column, sent to me by my friend Nancy. The author is the writer, Brett Battles, who has a number of adopted children, as well as siblings who were adopted.
There are a lot of adopted children, in my town of Croton.
To me, whether you're born directly into a family or find some other way there, such as adoption, it doesn't matter. You are family, no less and no more than anyone else. My brother and sister (twins, because my parents didn't want to separate them when it turned out the birth mother had two instead of one) came into our house when I was 4 and they were only 6 days old. Were they less my brother and sister because they were adopted? Absolutely not. I can guarantee you, they were just as annoying growing up as if we'd shared the same DNA.