i currently reside in Iowa. i am considering marrying my longtime best friend so he will be able to stay in the us. would i be financially responsible in a legal sense for any business dealings he may decide to try? could a prenup agreement be arranged stating that i am not responsible for any financial circumstances that might arise. also, i don't think he has been married before, but being from an arab country, if he was married there can he remarry to a us citizen legally?