Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
What do you mean by share your wife's subscription? Are you saying she's the holder of a family plan, and you want to join her family plan?
If so, check your personal plan online in your account https://account.live.com > subscriptions. When does it expire? You might want to wait til it expires to join. As long as she invites you on your same Microsoft account, you will not experience data loss.