CloudKernel11 covered the third party app side really well. Let me talk about what your phone’s own ecosystem already gives you, because a lot of parents do not realise this stuff exists natively.
Apple Devices: Screen Time and iCloud
If your family is on iPhones or iPads, Apple Screen Time is already sitting there waiting to be used. You set it up through Family Sharing, which you can configure right in your device settings. Once your child’s account is linked to yours through Family Sharing, you get access to things like usage reports, app approvals, and content restrictions.
Now the camera roll part specifically. If your child uses iCloud Photos and their iCloud account is set up under your Family Sharing group, there are ways to create shared albums where photos can be visible to family members. It is not an automatic full mirror of their gallery but you can set up a shared family album that they add to. More importantly, if the child is young enough and the device is one you manage through Apple’s Screen Time settings, you have more direct oversight.
For full photo backup visibility, if the parent owns the Apple ID the child is using (which is common for younger kids), then that same Apple ID backs up to iCloud and you can access it through iCloud.com on any browser. This is completely within Apple’s terms when you own the account.
Android Devices: Google Family Link
Google Family Link is the Android equivalent and honestly it is quite powerful. Once set up, you can see the apps installed, manage screen time, approve downloads, and track location. For photos, if the child’s Google account is backed up to Google Photos and you have access to that account, you can view the backed up media through Google Photos on your own device or browser.
Family Link gives parents the ability to manage the child’s Google Account directly, which means you have access to what is synced to that account including photos.
Both these systems work because the parent either owns the account or has set up the device under a managed family plan. This is very different from installing something without knowledge. These are transparent by design and Google and Apple both recommend telling your child these features are active.