Both of my children love the water so the first day last week we were able to, we loaded up and went to Mimi's and Papa's to play in the pool! They adored the fact that they could climb in and out at their whim and I was a huge fan of the fact that their splashing didn't make a pool on my bathroom floor.
Two children in the bath tub make much more of a mess then one...
But, I believe that two children have more fun when bathing then one!
It appears that the same goes for swimming!