What should we do if grandma tries to teach us sex stories?

You should firmly but politely stop her. Say something like 'Grandma, this topic makes me uncomfortable. Let's talk about something else.'

No, it is not appropriate at all. Sex education is a sensitive topic, and it should be carried out by appropriate educators, such as parents in an appropriate way or professional sex education teachers in a school setting. Grandmas are usually associated with family values, love, and traditional teachings, not sexual content.

Tell them firmly that you are not interested in such inappropriate content.

First of all, immediately interrupt grandpa. Let him know that this is an unacceptable behavior. After that, depending on the age of the person he was trying to teach, either the parents or guardians should take over the task of providing appropriate sex education at the right time, following scientific and ethical guidelines.

Politely stop her. Let her know that this is not an appropriate topic for her to discuss with you.

Firstly, make it clear that this kind of story is not acceptable in your communication. For example, you could say 'Grandma, this makes me uncomfortable.' Then, try to engage her in other activities or conversations that are more appropriate, such as cooking together or talking about her favorite books. If the problem persists, seek the help of a more neutral third party, like a family counselor or a respected elder in the family who can communicate with your grandma about the inappropriateness of such behavior.

Tell her that you have your own reliable sources for learning about such matters, like educational books or official health websites. For example, you could say 'I prefer to learn about these things from proper educational resources, thank you.' This way, you make it clear that her approach is not welcome without being rude.

It should be stopped immediately. The brother should firmly tell his sister that this is not acceptable behavior.

First, the granddaughter should immediately tell her parents or another trusted adult. Then, the adults need to have a serious conversation with the grandpa about the inappropriateness of his actions.

Politely stop her. You can say something like 'Grandma, this topic makes me uncomfortable. Let's talk about something else.'