Hi there,
Congratulations on deciding to expand your family through adoption! We are a multi-racial family, as our oldest son is biological (white), our younger son is from Guatemala, and our daughter is from South Korea.
Our son was four years old when his brother came home from Guatemala. We prepared him in much the same way any other family does about a new sibling. However, we did show him lots of pictures of latino children and explained that his brother would have brown skin and black hair since he is from Guatemala. When both boys were here and we were awaiting our daughter, we showed them pictures of Asian children so they would know what to expect.
We do get looks sometimes, and sometimes questions. But 80% of it is very positive. When it's not (positive), we use it as a learning experience. A recent example was last week. We were getting quotes for a new roof on our home. The man from one of the roofing companies proudly stated that his was an "all white crew." My oldest son asked what that meant. We explained that the man felt it was good to only have white people in his company. My son was HORRIFIED and was very happy to learn that we wouldn't use that company to put on our roof. (Sidebar--the man whose company DID install our new roof has two sisters from Korea).
Sorry I made a short story long, but I think my point is that being a multi-racial family is an amazing thing. It has been a wonderful learning experience for both me and my children.
Good luck to you!
Carolyn