Seven years old twins who defied doctors expectations

A pair of conjoined twins who share a brain and a skull have defied doctors' expectations and have learned to walk, talk and even argue with one another.

When Tatiana and Krista Hogan, now seven, were born, their parents were warned to expect the worst with the twins not expected to survive the day.

But the children, who live with their family in Vernon, British Columbia, have continued to defy expectations and now enjoy similar lives to their classmates.