Is it permissible to expose a brother's private parts to ensure the health of his reproductive organs, and is it permissible to remove one's pubic hair in front of him so he knows how to do it?

If the child is under seven years old, it is not forbidden to uncover one's 'awrah in front of him, nor to uncover his 'awrah, unless there is a fear of mischief or lust. Some scholars permit viewing and touching, with the exception of the two private parts (front and back), except for the mother and those who care for the child out of necessity. Imam Al-Shafi'i mentioned that a child falls into three categories: one who does not recount what he sees, one who recounts without lust, and one who recounts with lust, and each case has its ruling regarding the uncovering of the 'awrah. However, if the child is above seven years old, his 'awrah consists only of the two private parts. From the age of ten and above, his 'awrah is like that of adults. Therefore, it is forbidden to look at his 'awrah or to uncover one's 'awrah in front of him, except out of necessity or urgent need.