Someone else hacked my account and set

Hi. I’ve noticed that my account wasn’t under my control and things were happening with my phone that seemed impossible. Now I have realized after much research that my ex (and his mom) set up family sharing on my phone and put me iN as

a child. I need to delete

all of the stuff that did. What do I need to do to secure my

account

and make sure my ex and his family are deleted for good and also gain proof of who has been accessing

my

accpubt to make these changes and where drom