What should I take to my questionable Japanese host family?

I was accepted into a Japanese credit abroad program for this summer and I will be spending 10 days with a family in Fukuoka during my trip. The problem is I want to bring gifts for the family, but I won't know the dynamics (mom, dad, children) of the family until I get there. What would be a few good ideas to bring them that would be acceptable if there were boys or girls or for the parents? Thanks for the help!