You need to go back to Economy with the child and let your wife sit in your Business seat. This is a much, much more reasonable alternative. For one, you're swapping 1 person for 1 person, not adding a second person. Secondly, its a lot less movement. You didn't purchase 2 seats in business, you purchased 1 in business and 2 in economy, so that is your right to occupy. Your child is not an infant and therefore requires a seat and you only have 1. I wont get into the children in J thing, thats not my argument.