We used to live in Paris and went to the CDG AC several times a year when flying back to the US. At that time, only my husband was PLAT and I had no status. We have two kids who ranged in age from 2-5 and 4-7 during those years. There was only one occasion when we were flying Y and they didn't want to let us all in because of the 'one guest' rule. My husband didn't get upset but just said 'oh, it's never been a problem in the past' and they let us in. If they had enforced the rule, we would have understood and not made a fuss. Luckily that wasn't the case.

However, we did try a BA lounge once and were flately refused. So we never tried that again!

Thankfully I'm PLAT now as well so we can all legitimately get in the lounge when we are together. However, I travel with the kids alone some and have never been questioned or rejected at any AA lounge when trying to get the 3 of us in (kids are 8 and 10 now and are very well behaved in the lounge).

Good luck,
Kim