The Parent Split-Face Trend or Family Resemblance Trend, also known as the Mom Effect Trend or Dad Effect Trend, is a viral social media trend in which users take two portraits, one of themselves and the other of their mom or dad, and merge half of their face with a parent's to show family resemblance. The comparison trend emerged in August 2026 and spread on TikTok and other social media platforms over the following weeks, with many users utilizing AI tools to generate the black-and-white photos.
As the trend spread, some also created additional comparisons using the split-face portrait template to see how they looked compared to siblings and other family members, as well as couples comparing each other's faces. Many of the posts within the trend notably use captions like "you look like your mom" or "you look just like your dad" alongside the images. Some also use color photos instead of black-and-white pictures.