This is the same tile that existed when we moved in 10 years ago. Over the years, our kids have splashed water out while playing in bathtub and some toilet accidents... it has caused some areas to start showing hairline cracks revealing the big tile is really just a bunch of small ones placed together. Is there any easy fix to cover this somehow, or will my only real option to redo the entire floor? Thanks!

Thanks for the comments, and the answers are lining up with my thoughts. You are all correct, there have been countless lazy attempts in the house where they cut corners, so it would not be surprising if they did that here as well. Guess redoing this at some point is the #1 option.