There is no shortage of lawyers involved in Katie Holmes's divorce from Tom Cruise. But the attorney who may have played the most important role is not even handling the case.

Martin Holmes, 67, helped orchestrate his daughter's sudden split from her husband of five years, as WHO Magazine reports in this week's cover story, on newsstands now.

Sources say her Ohio-based lawyer father, Martin Holmes, "came into town and fired people surrounding Katie,” the source tells WHO Magazine. “He took control. He was worried about his daughter.”

Pointedly, he fired her security team, who he thought may have been reporting back to Cruise. Yet ultimately, Holmes was “unwavering” in her decision. “She’s a strong person and she makes up her own mind,” says the source.

A University of Toledo law school grad and member of the Ohio Bar since 1971, he practices in areas including personal personal injury, business litigation, probate and matrimonial law.

"Marty is very rigid – it's his way or the highway," says a Toledo attorney who has worked with both Martin Holmes and his son, attorney Martin Jr., on cases. "Marty believes there are only two sets of rules: the rules of the court and his rules, and he carries himself that way."

• PHOTOS: Tom Cruise & Katie Holmes: Before TomKat

Along with his homemaker wife Kathy, 65, Martin raised five children: Tamera, 44, Holly, 43, Martin Jr., 42, Nancy, 38, and the baby of the family, 33-year-old Katie.

As parents, Martin and Kathy "laid down the law but always with a lot of love," a relative told WHO Magazine in 2006.

WHO Breaking News Special Edition Issue - ON SALE TODAY!

After their youngest daughter began dating Cruise, 50, in 2005, rumours quickly emerged that the actress's parents were wary of the relationship. But publicly, Martin was always supportive of Cruise, calling him a "humanitarian" in a statement to Access Hollywood, and both Tom and Katie denied any tensions with her family.

"Some of the crap that's out there – the stuff that's said about my parents and my siblings [not hitting it off with Tom], it's really frustrating," Holmes told Vanity Fair in 2006 after welcoming daughter Suri.

• PHOTOS: Tom Cruise & Katie Holmes Through The Years

And indeed, at the rehearsal dinner for the couple's wedding in November 2006, Martin offered an emotional and welcoming toast to his famous new son-in-law.

"There is a line in the movie Father of the Bride where Steve Martin talks about how a time comes when you have a daughter that you stop worrying about her meeting the wrong guy ... and you worry about her meeting the right guy," Martin said. "It didn't take much time before I realized this Tom guy was a special guy – that he loved Katie, that he cared for her and supported her. Tom expressed his love many different ways – I like that. I respect men who are not afraid to show their feelings. I respect Tom for the commitment he has made to provide happiness and love to Katie."

For the full story behind the breakdown of Hollywood's most famous marriage, pick up WHO Magazine's Special Early Edition issue, on sale NOW!