With the exception of a season with Jahidi White, a member of the Ewing or Mourning family are the only men to have worn Georgetown's #33 jersey for two generations. The last of these men, Trey Mourning, had a different college career than his father, and a much more challenging one.

Trey Mourning grew up in much different circumstances than his father, and wasn't expected to be at his competitive level, but acquitted himself with some strong school credentials. The Dade County Player of the Year in 2014, Mourning averaged 29 points a game for Ransom Everglades, a private school in Coconut Grove, with a career high 52 point, 22 rebound effort versus Immaculata-La Salle. Earning three-star recruit status from Rivals.com, Mourning received interest from Duke and an offer from Florida, but followed his father's footsteps to Georgetown in the fall of 2014.

For reasons never publicly explained, John Thompson III did little to advance Mourning's college career. Trey played in just six games as a freshman, fewer than walk-ons David Allen or Riyan Williams. Mourning played in just 12 minutes that entire season, failing to score, leading some to falsely assume he was a walk-on. As a sophomore, Mourning averaged less than two points per game, seeing significant action in just one game, where an injury to Bradley Hayes and foul trouble with Jessie Govan forced Thompson to play Mourning in a game versus Providence, where he scored 10 points and five rebounds in 19 minutes of play. The results were quickly forgotten, as Mourning received only 23 minutes of time on the court the remainder of the season.

Whatever dissatisfaction Thompson had towards Mourning was most evident in 2016-17. Mourning was reduced to one minute appearances in blowout games and played in just 18 minutes the entire season. A low point came on Dec. 10, 2016, with the Hoyas playing in Mourning's home town of Miami versus LaSalle in a fundraiser for his father's charitable foundation. The Hoyas won comfortably, 93-78, but Thompson did not insert Trey into the game until the final 30 seconds of the contest. Though he made no public comments towards his playing time, online chatter surfaced towards the end of the season that Mourning would consider a transfer to complete his studies.

John Thompson III's departure and the arrival of Patrick Ewing provided a change in Mourning's career narrative. Ewing was a close family friend and Mourning wanted to play under Ewing, but an off-season hip injury forced a medical redshirt in 2017-18, whereupon Mourning graduated from the College and opted to pursue a master's degree with his fifth year of eligibility.

Heading into the final week of the 2018-19 home season, Mourning has been a valuable reserve, starting in 11 games and currently sixth in scoring with a 6.5 points per game average. Trey earned a career high 27 points and 12 rebounds in a non-conference win over Campbell, and has helped steady the Hoyas' second half defense in recent Big East games with Villanova and Creighton, placing third on the team in offensive rebounds and fifth in rebounds overall. A three time Big East Academic All-Star, Mourning received his bachelor's degree in 2018 and is on course to graduate this spring with a master's degree in sports management.