You definitely need to ask your son or the mother of the kids regarding their interest. For little boys I would say you cannot go wrong with Star Wars. Or if the 6 yr. old is a girl - Disney Princess usually hit the mark. But you don't really know until you ask. My eldest daughter was never into pink when she was little - she isn't now either - but she was in to Disney and she loved sports, so I made her a Charger quillow when she was in the 6th grade and she was thrilled. So you don't know until you ask.