Okie oki ok.
Before I start, this is highly opinionated so you don't have to listen to me, but just hear me out. This is Mine Craft. Not YouTube or Tumblr. We do enjoy you Lauren, just not your spammy forum posts. Maybe you could create a YouTube channel about your daily life instead of a Mine...
Extremely problematic, imagine you piss off your husband/wife, they go into the account, wipe everything. It maybe could work, but it's a lot of trouble especially when you can easily manage your own account and let your spouse have their own.
People could steal the book and know how to get into your place, could be abused and easily scammed, etc. Although this is a good idea, it will most likely not be implanted due to its cons.