I don't have a wife yet, so I can't answer your question but if I do get a wife I would let her know about my Bitcoin holdings. However, I would keep my Bitcoin securely stored for myself because I don't trust anyone else to maintain the same level of security as I currently do. So essentially I'd share all the information with her and gradually teach her how to use Bitcoin and how to keep it secure. I'd also inform her where I store my seed phrase when I'm ready to.

Actually it's really risky to do that and it's advisable to share your Bitcoin seed phrase only with a person you trust the most, someone you are sure that won't attempt to steal your funds. Alternatively, you might opt to keep the seed phrase entirely to yourself to avoid getting your money stolen.