yes - how can an extra person get into a secured place on someone else's security clearance? just because they probably arent a security risk, doesnt negate the fact you are trying to get 2 people in on one security clearance. IfMPs children are allowed in the chamber, where does it end? your 12 yo school is having an inset day, so they come and sit in the chamber playing their nintendo? You 17 year old son at a loose end? just bring him in!