Chang's divorced father married gretchen's divorced mother. they all live in the same house. what type of family is this?

If Chang's divorced father married Gretchen's divorced mother, and they all live in the same house, then this would be a blended type of family.

So, two completely different parts of two completely different families are blended into one single new family that lives together. Although they weren't originally one family, they did become one because of the love of the parents who decided to get married.