Can search history be seen by Apple ID? I was searching up homework answers 3 years ago on my iPod but my cousin and I share an Apple ID that she made, and before that and before I had her Apple ID I had my Uncle's I don’t want them to know and tell my mom. Did they see my search history?
It is possible to see search history. 

If Safari for iCloud is enabled all enabled devices will be able to see your search history when going into the tabs screen to see what tanks are open. NOTE: This is only recent history. I doubt that 4 years back you will be able to view it.

If you want to turn off search history go to Settings -> [your name] -> iCloud and turn Safari off.