Hard convos

I'm having trouble with my wife, she's from Tokyo and I'm from Osaka, we have different ways of talking about things. Lately, my brother came out as gay and I don't know how to bring it up with her, I wonder if she'll be okay with it. It is not good to assume she'll react badly, but I've seen how her family can be. We've been married for 5 years and I still feel like I'm walking on eggshells sometimes. I want to support my brother, but I also don't want to cause any problems at home. I feel like I'm stuck, 🤦