Later, I called the mother, and we had it out on the phone. When I found out what went on, I hit the roof. The mother apparently went out shopping, and the father convinced the boys to join him in the pool, naked. It seems the boys had been skinny-dipping. However, when my husband picked Mike up later, he noticed his bathing suit was completely dry, although his hair was wet. I talked to the mother, who seemed nice, and she promised that the party would be well-supervised. WE RECENTLY MOVED TO THIS AREA AND WERE PLEASED THAT MIKE HAD MADE NEW FRIENDS. DEAR ANNIE A FEW WEEKS AGO, OUR 13-YEAR-OLD SON, 'MIKE,' WAS INVITED TO A BIRTHDAY SWIM PARTY AT THE HOME OF A CLASSMATE.