Christmas presents for a german family?

i would have to ship it to them, so i don't want it too be too large or too heavy. i stayed with this family for a month this summer so i'd like to send them something. i realize it probably won't make it in time, but whatever. the family consists of a mom who loves to cook and likes 70s-80s music, a dad who works as an engineer, a 14 year old girl, who plays soccer and is somewhat of a tomboy, a 12 year old sister, who also plays soccer but is girly and likes music like kelly clarkson and such, a 10 year old boy, and a 4 year old boy who has problems walking and cant run because he has to wear braces on his legs. i would like to get them one thing that they could all enjoy, but i don't know what to do!! and obviously it shouldn't be too expensive.