Family can delete content they've uploaded; parents can delete content anyone has added to their Lifecake(s).
On the iPhone, iPod or iPad, to delete content:
Step 1: Tap on the content you would like to delete.
Step 2: When displayed full-screen, tap on the Info button on the top on the iPhone or iPod (circled in red below):
Step 3: Tap on the option to Delete photo.
Once deleted, content will be removed completely from Lifecake. When your family update their timelines, the content will also disappear from their devices or browser.