The purpose of March 8th Women's Day is to thank the majority of women for their contributions to society and family. However, in fact, the contribution of men to the family cannot be ignored. They are the sky and the backbone of a family, and they are even greater.
Therefore, it is also very good to give gifts to the majority of male compatriots on March 8th Women's Day. Your sister is pregnant now, and your brother-in-law must be busy at home and outside, so you can give him some small appliances, such as soymilk machines, which his family does not have, because boys are not good at housework. If you give these to him, his housework ability will be greatly facilitated. I believe he will be very grateful to you, hehe.
Then you can also give your brother-in-law a razor or something. Although this is more intimate, he is your brother-in-law. As long as your sister doesn't mind, it should be good. I hope the above answers are helpful to you.