Beating Australia at the World Cup runs in the Moriarty family - and Wales' current back-rower Ross loved tearing into the Wallabies to keep the tradition going.
The last time a Welsh side beat the Aussies at the tournament was back in 1987 in the third-place playoff, when Moriarty's father Paul and uncle Richard played.
'It was a great game to be involved in,' said the 25-year-old of Sunday's win.
Flanker Ross Moriarty has come off the bench in both of Wales' World Cup matches so far
Moriarty celebrates after a stunning victory over Wales put his side on course for quarter-finals
'When you win those tight games it makes it a lot more special. Last time we won a World Cup game against Australia was 1987 - that was a special game for me as my dad and my uncle were in the team.
'Dad's very emotional when it comes to me playing rugby, especially for Wales. To be involved for this World Cup, it was a big one.
'My parents came out for the game, and have gone home now, but it was a special day for me.
'They'll be coming back when we get to the final!'
Moriarty's father Paul (centre) played for Wales during the 1987 World Cup and beat Wallabies
Richard, Moriarty's uncle, was Wales captain and earned 23 international caps in his career
Moriarty started 28 of his 29 Tests from the summer of 2016 up to this World Cup - but was dropped to the bench for the Georgia and Australia matches in Japan.
Aaron Wainwright, the 22-year-old, has been preferred at blindside flanker with Josh Navidi moving to No 8.
And while losing his shirt has upset Moriarty, he has been leading the charge in training.
Alun Wyn Jones revealed there had been blood spilled last week - and Moriarty feels physical sessions primed Wales for their famous victory.
'When we have to