With England 3-0 down in the Ashes series with just two Tests in Melbourne and Sydney to play, the 34-year-old Swann took the decision to announce his retirement on Sunday morning with immediate effect.
Although England's record-breaking off-spinner was in the twilight of his career after three operations on his bowling elbow, his announcement has taken many by surprise, and perhaps none more so than his own grandmother.
Mina Swann believes something unpleasant may have happened Down Under to force Swann's hand, which may have also counted towards Jonathan Trott returning home due to a stress-related illness.
"There is something gone wrong there and I blame the Australian players. Not all the Australian players, a certain one," said Mina Swann to The Journal.
"When the team went down to Australia and that young lad (Trott) came back, there was something going wrong then.
"I do not think they have been (made) very welcome, the team. He is not easily upset, there is something nasty happened.
"He was as happy as Larry. He adored his cricket. It is a damn shame, he has lived for that game, he has done everything for that game."