Not quite, it is three adults and one child, but you are right that I want two adults to sit in business. Initially it was only two of us travelling so I booked both in business (including the one child). Then more people decided to come but I couldn't get more business tickets, so I thought maybe we could swap and make the most of the two seats we have in business..
I was 14 when I first flew in business class on an international flight. It was a big treat that wasn't topped for more than a decade (stopped travelling on family holidays, and couldn't afford it on my own dime).
So I would give some consideration to letting the seating stand for an older child as they may get more out of it
