She nods

She nodded slightly to Sarah, who got the idea.

"Yeah, no problem! This here is Kirsten, please don't ask her about her uhh... bottom piece. She has a little issue."

"Hi!" said Kirsten waving at the family.

Only now the father noticed the diaper, but he to averted his gaze to be polite. They all seemed to bother more with the diaper more than with the nudity, but this was a nude beach so technically this was normal here.

When the family put down their towels Kirsten inspected the family. The teenage daughter was the first to undress, and from underneath her clothing appeared a regular bikini. Then the youngest son dressed down, and quickly Kirsten averted her gaze. The kid was undressing all the way, but wasn't wearing any swim clothes under them.

She gave it some time and looked again. She saw all of the family had undressed now, but not in a regular way. They were nudists! Not only the young son but also the mother and father were completely nude on the beach. The teenage daughter was the only dressed one, probably because of her age.

Kirsten and Sarah looked at each other. It was a look of sudden desperation, but when they met their eyes they both suddenly started giggling. This was also kind off hilarious.

The family did their thing. The parents started reading while the kids jumped into the water and played.

Meanwhile nobody had paid any attention to Kirsten and her diapered and undressed state.