What would be a good gift for my son's German host family?

My son leaves in two weeks for his student exchange trip to Germany (Bavaria). The students are asked to bring a gift for their host family.

At this time I only know that there is a mother, father and daughter (age 16/17). The daughter is not the best at keeping in touch with my son to find out about siblings and family interests.

Can you help me think of an appropriate and fairly inexpensive gift for the entire family? I hate to wait until the last minute to buy the gift.