In one scene the mother gets Thomas out the bathtub for drying and dressing him (full nudity). After that the other 2 older boys leave the bathtub. Short rear view of Sascha and partial side view of Jonny.
Luke (Logan Lerman, 10) was taking a bath in front of a house covered by provisional paravan while his mother was pouring water on him. The boy was seen only from his waist up when he was standing next to a basin with water.