is it possible for a black woman married to a white to give birth to twine children, black & white at a time?

Answer 1

Yes, it is highly possible. When I was growing up we had a couple like that, and out of it came two girls, one white, one black. No one ever believed them until they were shown the birth certificates. It all has to do with your genes and the fathers genes. I know that if you have two biracial parents it is more likely to happen than if you were only one race.
http://en.wikipedia.org/wiki/Kian_and_Remee_Hodgson

Answer 2

Of course! Check this article out:

http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=377839&in_page_id=1770

Answer 3

Yes, you never know if a child is going to inherit traits from their mother or father. Their DNA is made up of both.