Johnny DiMera is a fictional character from the NBC soap opera Days of Our Lives portrayed by a number of child actors from 2007-14. Johnny is the son of EJ DiMera and Sami Brady. He was born October 23, 2007. He was originally believed to be the son of Lucas Horton, but after the child's birth, E.J. begins to suspect that the fraternal twins might have different fathers because Johnny does not look like his sister. A second DNA test reveals E.J. to be the father. Johnny has one older maternal half-brother Will Horton, twin maternal half-sister, Allie Horton, and one sister, Sydney DiMera.