How to password protect apps on ipad?

So i have an ipad 1 or 2 with ios 9.3.5. I use a lot of apps that are personal to me but my family use the ipad sometimes as well and i dont like them getting into those apps of mine an looking at my private stuff, which i know they do! Is there any way i can put a password on certain apps, or a folder i have created, that would stop anybody getting into the app without a password? Maybe any of you know a app that can be downloaded for this purpose, even if it comes from a third party app store? I have tried putting restrictions on through settings, but the apps are apps that i have downloaded and they dont show up on teh list so i cant lock them.. please help!