Our airbag in the front passenger seat cannot be turned off and so I don't like to put any children in the front. However, I have 3 and so if we have someone back for tea one child (always one of mine) has to sit in the front. Just wanted to know how safe this is? My oldest is 9 (although petite) am thinking I still put her in booster and put seat back as far as possible is this OK?