Is it normal for my brother-in-law and sister-in-law to joke?

Brother-in-law and sister-in-law should be regarded as a family. It's normal to have a normal chat and make jokes. There's nothing to make a fuss about, but there's nothing absolute in the world. If you joke and say more than ordinary people should say, there's no guarantee that their jokes will be completely normal. After all, anything can happen in the world.

The premise is that it is ok to joke normally. As long as you are at home or in public, you should pay attention to it if two people often joke together alone.

People are more open now. They must have felt a little unnatural in the past, but now there should be no problem. It should be normal for relatives to play a joke.