Totally agree with you there Berti, She is after all catherine Middleton, fiance of Prince William not Lady Diana Spencer who married Prince Charles, Prince of wales.
I read somewhere that William and Kate would might choose younger members of the BRF to be apart of the wedding party, I doubt that very much as many members of the BRF who have young children, distincly have kept them out of the limelight and given them a normal life, so I think they would say no to the idea of having thier children in such an event as this wedding, take Prince Edward and Sophie's children and the Chatto family, thier children are rarely seen at public events so why now would the put them in the limelight maybe as a favor to Will but I doubt that very much so.
I will have to try and find the article that I read it in.