Ramsay's father-in-law Chris Hutcheson, 68, along with his sons, Adam Hutcheson, 46, and Chris Hutcheson Jnr, 37, admitted a plot to hack into Gordon Ramsay Holdings Ltd between October 23, 2010 and March 31, 2011.
All three defendants, who are on bail, face up to two years behind bars when they are sentenced at the Old Bailey on Wednesday.
Hutcheson Snr, who is the father of Ramsay's wife, Tana, was involved in a very public falling out with the chef, some of which was aired in legal battles heard at the High Court.
At an earlier hearing, prosecutor Dan Suter had described the case as "convoluted and voluminous".
"At the time of the alleged conspiracy, Chris Hutcheson Snr had been dismissed by Gordon Ramsay Holdings Ltd. He has previously held a senior position with GRHL," he said.
"The prosecution would say as a result of that dismissal he was motivated to access unlawfully the computer system.
"There was surrounding civil litigation after his dismissal.
"Subsequently, Adam Hutcheson was also dismissed from GRHL."
The prosecution alleged emails were exchanged between Chris Hutcheson Snr and Adam Hutcheson, discussing how they could "crack into" specific email accounts of GRHL employees.
It was alleged the accounts were hacked to access material that could prove useful in the civil litigation proceedings.
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