First of all, it's important to stay calm. Don't overreact and embarrass him too much. You could have a private and gentle conversation with him about appropriate behavior and privacy. Let him know that such activities should be done in a private space.
When you catch your little brother in such a situation, it can be really uncomfortable for both of you. You should respect his privacy as much as possible even in that moment. Later, find a time to sit down with him. Explain to him that while these feelings are normal, there are appropriate places and times for such behavior. You can also offer to get him some books or resources about puberty and growing up in a healthy way, so he can better understand his own body and how to act appropriately.
If you catch your little brother jerking off, it's an extremely awkward situation. First, try not to overreact. You could simply leave the area quietly to give him some privacy. Then, later on, you might consider having a general talk about privacy in the house without specifically mentioning the incident. For example, you could say that everyone needs their own private time and space.
The simplest way is to pretend you saw nothing. Just turn around and leave as if it was a normal thing. This can save both of you from extreme embarrassment.
When having this conversation, it's crucial to make him feel safe. Don't shame him. For instance, you could start with 'I know this is a bit embarrassing, but I think we should talk about what I saw. Jerking off is normal, but it's not something we do in public or where others can easily see. We should respect the privacy of our bodies.' Then have an open - ended conversation where he can ask questions or share his thoughts.
Avoid making fun of him or using this incident to tease him in the future. This can create long - term psychological damage. Also, don't ignore the situation completely. It's important to address it in a proper way, but not through negative means like yelling or scolding.
Tell him that what he saw was something personal and private. For example, 'Little brother, that was a private moment for me. We all have things we do in private, and now you know that you should always knock before coming into a room.'
The mom might also consider providing some basic education on puberty and the physical changes that come with it. She could give him a book or some resources that are age - appropriate. This way, the son gets the right information and feels that his mom is there to support him, not to shame him.
This is a rather sensitive and potentially inappropriate topic. It's not advisable to focus on or promote such content.
The teen should probably first stay calm and avoid overreacting. It's an extremely awkward situation, but panicking will only make it worse. Maybe quickly cover up and apologize for the inappropriate behavior in a place that should be private.
If a mom catches such stories, she should first stay calm. Then, depending on who is involved, if it's her children, she can have an age - appropriate conversation about appropriate content and values. For example, if they are teenagers, she can talk about the importance of respect and privacy in relationships.
If you catch your wife in such a situation, the first thing is to stay calm. Try to have an open and honest conversation with her about your feelings. Maybe there are underlying issues in your relationship that need to be addressed.