I recommend checking out CultureGrams. This source has a listing for every country and gives some good basic background on all aspects of culture, with short paragraphs on family structure, gender roles, health, and more. Once this source puts things in context, you will definitely want to head to books or journals for more information.
The above is only a select list of SPU databases I think will be most helpful for this assignment. There could be other helpful databases for your topic.
Not sure which database is best for your topic? Ask a Librarian!
Some tips for searching books: