My Kids yesterday at home after school wants to take a bath under the rain but my wife doesn't want them to do so . What are the pros and cons in taking a rain water bath ?

I think the obvious cons would be if your kids didn't properly dry off with a towel after playing around in the rain, they'd be at risk of catching a cold or getting sick. So make sure they dry off as soon as they're done playing, and maybe that they stay out of the rain for TOO long. On the positive side, it gives kids an interesting way to enjoy rainy season, and a cool way to enjoy playing outside.