iPhone secure boot
Can I make a secure boot from my iPhone? How do I tell us a member of my family is using side loaded apps
iPhone 13 Pro Max, iOS 16
If you believe that compromised apps may have been loaded on to your phone, I recommend that you restore the phone to factory state, not to a back up.
Restore your iPhone, iPad, or iPod to factory settings - Apple Support
And, in future, don't give those family members you don't trust access to your phone.