"Easter with #demkids #moments #rocandroe #easter #family," the pop star wrote on Instagram alongside a photo of the group posing together as they worked on painting Easter eggs.
Easter marks the latest reunion between Carey and Cannon who were last seen together in March bringing Monroe and Moroccan to the Nickelodeon Kids' Choice Awards.
The pair were married in 2008 but split in 2014. The divorce was finalized in 2016.
Carey recently made headlines as she ended her five-month romance with her backup dancer, Bryan Tanaka.