Junior and Sparkle announced that they were expecting another baby during the TV special about Dick Tracy hosted by Wendy Wichel.
Later, Sparkle went into labor on the same night that Gruesome blew up the Patterson Playhouse. This delayed Dick Tracy's arrival at the hospital. By the time Tracy arrived, his grandson had been born.
Stiletta Jones (aka Mrs. Flattop) soon planned to kidnap Trey as means of inflicting suffering on Dick Tracy, but she was killed before she could act on her plot.
Trey's birth was depicted on Christmas Day, 2014. His name and gender were not revealed until 2 weeks later. Due to the nature of the strip's sliding time-line, it is unclear if December 25th will be considered Trey's official birthday.