Nancy Kerrigan's Brother: Just One Example of Parents Suing Their Children

The news that Mark Kerrigan, brother of the former Olympic ice skater Nancy Kerrigan, may have played a role in his father's death was shocking. But that revelation was followed closely by another: that in March 2008, Daniel and Brenda Kerrigan had taken the unusual and difficult step of suing Mark -- suing their own son -- for allegedly refusing to pay back more than $100,000 in loans.

86-year-old Peg Savo of Clarks Summit, Pa., knows just how difficult it is for a parent to decide to sue a child. She is in the middle of a lawsuit against her only son, Frank.

VIDEO: The Olympic figure-skating champions brother is charged with assault.Play

"I am brokenhearted. I can't sleep some nights thinking about it. Mother's Day is coming…I didn't see him Christmas or Thanksgiving and it's been like this for two years," she said.

For years, Peg and her late husband Frank were involved in the real estate business in Clarks Summit, aquiring a number of properties in both of their names. When Frank Savo died he left everything to his wife.

But after his death, Peg Savo's health went downhill for a time -- she had a hip replacement, felt depressed and was on medication.

At that time, according to Savo's attorney, Ernest Preate Jr., 54-year-old Frank J. Savo asked his mother to sign some documents -- which she only later realized gave him control over her financial affairs and sole ownership of her real estate holdings.

They are currently valued at more than a million dollars. Calls by ABC News to Frank J. Savo were not returned.

Peg Savo's attorney says in August 2009, after a year's worth of phone calls and fruitless discussions, she filed suit against her son and two of his business partners.

"He came to me with something to sign so I signed it, but I couldn't believe it when I found out later what he did," she said.

"I was shocked. I trusted him implicitly with everything. Why would an only son do this to his mother?"

Mortgage Payments and Cat Food

The case of Mark Kerrigan is similarly tangled. According to court documents obtained by the Boston Herald, Daniel and Brenda Kerrigan claimed their son owed them money they had paid to cover many of his living expenses over several years. The list included $31,870 in mortgage payments, $1,336 for heating oil and $197 for cat food.

Mark Kerrigan, said the suit, never paid his parents back. At the time of lawsuit he was serving a two-year jail sentence on various charges including assault. Kerrigan also had a long history of run-ins with the law involving substance abuse.

'It's So Horrific That You Remember it When it Happens'

In his 23 years as an attorney in Charleston, S.C., Lyndsey Blanks has handled several cases in which a parent sued a child.

"It's so horrific that you remember it when it happens," he told ABC News.

Blanks said when a parent makes the decision to take legal action, in his experience, it is "always a last resort," and invariably involves an allegation of financial impropriety.

Parents Realizing a Painful Truth

Blanks remembers one case in which a mother sued her daughter to recover $80,000 -- a life's worth of savings -- that was removed from a joint checking account.

"People don't think their children will treat them that way," said Blanks, who added that his hardest job is often convincing parents to not sign over a power of attorney to their children without thinking through the consequences.

A power of attorney allows a child decision-making power and control of a parent's assets.

"When I talk to parents they almost always say the same thing -- my son or daughter would never treat me that way -- and most of the time they're right, but it does happen," said Blanks.

Family members suing one another is always traumatic, but particularly so when it involves a parent and child, according to Jane Honoroff, a licensed social worker and a principal with The Mediation Group in Brookline, Mass.

Honoroff said that even when they end, lawsuits rarely "repair anything, they just put it to rest." She said that's because taking legal action is "about trying to resolve otherwise-unresolved conflicts," conflicts a court of law can rarely settle.

Often families resort to court because the family dysfunction is ongoing and complicated by issues of mental illness and substance abuse. There can be huge splits within the family, said Honoroff, with one child pushing a parent to legal action, and others counseling against it.

Parents Vs. Children

In one case, Honoroff recalled, a stepmother sued her stepson over a family business. The result was a painful family rift.

"It is a pretty extreme step to file a lawsuit and these things are generally pretty destructive. Lawsuits always imply there is a right and a wrong, and one party ends up losing," said Honoroff.

In the Kerrigans' case, the paperwork suggested the lawsuit was simply about getting repayment for unpaid loans. But the underlying message the elder Kerrigans may have been trying to send their son is that he needed to get help for his various behavioral and substance-abuse issues.

The Kerrigan suit was eventually dismissed. Now, two years later, Mark Kerrigan is again in jail, this time facing much more serious charges.

As for Peg Savo, she expressed bewilderment at the turn her life has taken. She reminisces about making her son lunch every day for nine years as he struggled to start various businesses.

Now it has been two years since she last talked to him. She says she spends most of her days saying to herself, "I wonder where I failed."