Ablett is a member of what has been called the "Ablett dynasty", a group of footballers all descended from Alf and Colleen Ablett. Ablett's father, Gary Ablett Sr., and two of his uncles, Kevin and Geoff Ablett, played senior VFL football from the 1970s to the 1990s, and his brother, Nathan Ablett, and cousin, Luke Ablett, both played senior football in the 2000s and 2010s. In May 2012, it was noted that, all together, Ablett's family had played a total of 900 matches, with his immediate family (Ablett, his father, and his brother) having a combined total of 500 matches. Ablett's aunt, Fay Ablett, married Michael Tuck, who was up until the 2016 AFL premiership season the AFL's all-time games record holder, with whom she had two sons who also played league football: Shane and Travis Tuck. Ablett's great-uncle, Len Ablett, played in 's 1943 premiership side.