No your son is over reacting. My guess is your DIL has his balls in a jar on her nightstand or he has no brain. Hopefully he was just having a bad day.
No, my DIL was on my side. In fact she asked me if they could come to my house yesterday and swim. Funny thing was she had put sun screen on them at her house but forgot to bring it so I could reapply it. Needless to say the kids only got to play in the pool for an hour then I whisked them out of the sun.