This is an inappropriate and concerning statement. You should have an open and honest conversation with your wife about appropriate boundaries and the inappropriateness of such a topic. Make it clear that this kind of talk makes you uncomfortable and is not acceptable in a healthy relationship.
This is a very inappropriate situation. You should have an open and serious conversation with your wife about appropriate boundaries and family relationships. Explain to her that such statements are not acceptable in a healthy family and marriage context.
If she misses those cooking stories, you can help her set up a video call with her brother so they can talk about all the delicious meals they've made or tasted. You could also surprise her by trying to recreate some of the dishes her brother might have made based on the stories she's told you.
If you've caught your husband in such a situation, first, take some time to calm down. It's a very shocking discovery. You could consider having an open and honest conversation with him about why he did it, your feelings, and what it means for your relationship.
No. Such a situation is highly unethical and goes against the principles of loyalty and respect in a relationship. It involves inappropriate and disrespectful behavior towards one's spouse and violates the boundaries of a committed relationship.
Such a story involves extremely abnormal and unethical content. The appropriate reaction should be one of strong condemnation. This goes against basic moral and ethical norms in society.