Katie Holmes parents were reportedly getting inside information about the "iron grip" that Scientology had on Tom Cruise for years.

Martin and Kathleen Holmes are said to be relieved to have their daughter back following her split from the Hollywood star and support her fight for custody of six-year-old Suri.

But Marty Rathbun, a former Scientology member, told RadarOnline that an insider has been giving the family information about the alleged hold the organisation has on the Mission Impossible actor.

"I did audit sessions with Tom Cruise from 2001 to 2004," Marty told the site. "And I can tell you that I have a friend that has been providing Katie Holmes' family information about the iron grip that Scientology has on Tom Cruise's family and professional life. This has been going on for at least four years."

Meanwhile, Katie is reported to have planned her "escape" from Tom with surgical precision.

Us Weekly reports that the actress stopped going to Scientology classes months ago, hired new non-Scientologist employees so "she wouldn't be spied on" and distanced herself from Tom's family.

In divorce documents obtained by TMZ, Katie claims her marriage to Tom was "irretrievably" broken from at least six months ago and says they've been legal residents in New York for "at least two years."