If they have any favorite foods that are shippping safe, any music that they like that maybe they can not find over there, a personal video of family and friends wishing them well and safe return, pictures, if they have any kids CDS of them talking to them or pics, personal hygiene products.   A very close friends of mine would send her son  deodorant, music CDS, pop tarts, soda, body wash, sun glasses, video pics of family and friends.  I would ask the next time i was in contact with them and ask them what they would really like to have.  Also maybe some phone calling cards so they can talk to everyone they need too.   I wish your sibs well and a safe return.