I understand, not through experience but from a friend, that Virgin have a “vroom” lounge where you can pay to take people even if they are not members of their club. This is apparently seperate from the main lounge. Something like that would probably be ideal, with a tiered structured price for entry depending on status. That way there is no need for families to go into the main lounge.
Perhaps I am wrong but the idea of the lounges is to provide a sanctory from the main airport for Executive Club members and those flying premium cabins. I certainly don’t want the lounge to be over run with children et al.