Not that this bothers me b/c it doesn't apply in my case but I have a feeling that the MLL agents will be 'trained' to allow 'one person' along with the SE. That means, they probably won't care if that person that you are bringing is your guest, mother, god, dog, kids or 'one-time partner' (you know with the rules being so loose about 'spouse', you can basically grab anyone from the corridor and say it's your spouse ). So I think if they tried to bring more than one person with you, they are going to stop you and ask you to pay.

Here is a very funny scenario that I just thought of, wonder what would the MLL agents' reaction would be if: "You bring your kids with you on vacation but your spouse isn't with you. At the airport, you met a friend (any gender), let's say a good friend of yours that you haven't seen for a long time. You decide to invite him/her to the MLL to relax while you wait for your flights. But you suddenly remember that your friend isn't exactly your 'family'! Since you don't want to pay that $20 for a 40 minute 'relaxation treatment', you go in and tell MLL agent that this is your family (with kids). I wonder how they are going to react?"

a) Let you go without a hassle?
b) Demand your show proof of family link?
c) Laugh at you?
d) Pay $20 anyway per extra person
e) Ignore you?