I have also stayed at > 50-60 different hyatt hotels in US and internationally. This is the 1st time I have heard of this. If the rules of WOH is to allow Hyatt members and their guests (including children) access to lounge, if they make this exception, they need to make alternative compensations for excluding kids from the evening offerings. They can do something like what HR Churchill with kids only allowed in the family lounge. Those who don't want exposure to the kids can voluntarily not go to the lounge vs those with kids be involuntarily be excluded from the lounge. We all pay the same rates.